The plaintiff appeals dismissal of her Title VII action in which she charged her employer with sex discrimination. Her several claims of discrimination were based principally on the employer’s failure to furnish adequate, sanitary toilet facilities at the worksite where the plaintiff was employed. The district court conducted a bench trial, after which it issued an opinion containing extensive findings of fact and conclusions of law.
I.
The plaintiff was hired by the Construction Service Branch (CSB) of the Tennessee Valley Authority (TVA) as a carpenter apprentice. She began working in November 1979 at an electrical generating plant at Cumberland City, Tennessee where TVA was making major modifications. Most of this work was carried on in an open area adjacent to the main building of the plant, referred to as the “powerhouse.” The construction site covered three acres and contained two portable toilets for women, one at each end of the work area. There were also 21 other portable toilets on the site, not designated by sex, but primarily used by men.
The portable toilets were dirty, often had no toilet paper or paper that was soiled, and were not equipped with running water or sanitary napkins. In addition, those designated for women had no locks or bolts on the doors and one of them had a hole punched in the side. To avoid using the toilets, Ms. Lynch began holding her urine until she left work. Within three days after starting work she experienced pain and was advised that the practice she had adopted, as well as using contaminated toi*382let paper, frequently caused bladder infections.
The powerhouse was off limits to construction workers. It had large, clean, fully equipped restrooms and the plaintiff testified that some of the men she worked with used them regularly and were not disciplined. In late December 1979 or early January 1980 Ms. Lynch began using the powerhouse restrooms occasionally after her doctor diagnosed her condition as cystitis, a type of urinary tract infection. When the infection returned in February, the plaintiff began using a restroom in the powerhouse regularly and she had no further urinary tract infections. She admitted at trial that she knew use of the indoor restrooms by CSB personnel was prohibited.
In early January 1980 the carpenters’ union business agent told Ms. Lynch that he had received complaints that she was loafing on the job and performing her work unsatisfactorily. He identified the complainant as James Fogg, the general foreman under whom the plaintiff worked. The plaintiff denied loafing on the job and requested more formal evaluations of her work. In these evaluations she was generally rated good or fair. On April 16, 1980, Mr. Fogg saw Ms. Lynch at the powerhouse and issued a warning letter which stated that the plaintiff had violated job Rule No. 7, entitled “Loafing, Wasting of Time, or Eating During Work Hours.” The warning letter stated “this is an unauthorized area for Construction Service Branch personnel____ [Y]ou may be discharged if you again violate this rule within six (6) months of the above violation.” The plaintiff protested the warning letter, stating that it did not reflect the true nature of the incident. She also wrote to the manager of construction for TVA complaining that Mr. Fogg had singled her out for reprimands and stating that she used the powerhouse restroom because it was common knowledge that the portable toilets were not hygienically acceptable for women. A few days later she wrote the equal employment opportunity office of TVA, claiming that she was being subjected to discrimination and that it was inevitable that she would be discharged for using the powerhouse restrooms.
On May 1 James Fogg saw Ms. Lynch enter the powerhouse and called the construction superintendent, George Riddle, to meet him where the plaintiff came out of the powerhouse and returned to her work area. Mr. Riddle told her she was fired and directed her to collect her belongings and leave. TVA issued a notice of termination which gave the reason for discharge as “Unsatisfactory Conduct in Work Area.” Ms. Lynch filed a charge with the Equal Employment Opportunity Commission (EEOC) and received a right to sue letter. This action followed.
II.
Title VII of the Civil Rights Act of 1964, 42 U.S.C. § 2000e, et seq., permits a plaintiff to base a claim of employment discrimination on two separate theories— disparate treatment and disparate impact. A plaintiff may proceed on either or both theories; no election is required. Rowe v. Cleveland Pneumatic Co., 690 F.2d 88, 92 (6th Cir.1982). To prevail on a claim of disparate treatment a plaintiff must show that her employer intentionally discriminated against her. Direct evidence of intent is not required; the plaintiff can establish intent by proof of “actions taken by the employer from which one can infer, if such actions remain unexplained, that it is more likely than not that such actions were ‘based on a discriminatory criterion illegal under the Act.’ ” Furnco Construction Corp. v. Waters, 438 U.S. 567, 576, 98 S.Ct. 2943, 2949, 57 L.Ed.2d 957 (1978), quoting Teamsters v. United States, 431 U.S. 324, 358, 97 S.Ct. 1843, 1866, 52 L.Ed.2d 396 (1977). In a disparate treatment case, the trial court must consider all evidence of discriminatory intent — circumstantial as well as direct. United States Postal Service v. Aikens, 460 U.S. 711, 714 n. 3, 103 S.Ct. 1478, 1481 n. 3, 75 L.Ed.2d 403 (1983). A trial court’s finding on the issue of intent to discriminate is a pure question of fact, subject to review under the “clearly erroneous” standard of Rule 52(a), Fed.R.Civ.P. Pullman-Standard v. Swint, 456 U.S. 273, *383287-88, 102 S.Ct. 1781, 1789-90, 72 L.Ed.2d 66 (1982). The discriminatory intent that must be shown is actual motive, “not a legal presumption to be drawn from a factual showing of something less than actual motive.” Id. at 289-90, 102 S.Ct. at 1790-91.
A claimant proceeding under the disparate impact theory is not required to prove an intent to discriminate. In such a case, the trial court is concerned with “the consequences of employment practices, not simply the motivation.” Griggs v. Duke Power Co., 401 U.S. 424, 432, 91 S.Ct. 849, 854, 28 L.Ed.2d 158 (1971) (emphasis in original). Disparate impact cases typically are concerned with facially neutral practices or standards that in fact work to place a disproportionate burden on a discrete group of employees who are protected under Title VII.
A plaintiff has the ultimate burden of persuasion regardless of the theory under which she proceeds. If a plaintiff makes a prima facie case under the disparate treatment theory, the burden of production shifts to the defendant to articulate a legitimate nondiscriminatory explanation for its actions. If a defendant carries this burden, the plaintiff may still prevail by showing that the legitimate reasons offered by the employer were pretexts for discrimination and were not the real reasons for the action complained of. Texas Department of Community Affairs v. Burdine, 450 U.S. 248, 252-53, 101 S.Ct. 1089, 1093-94, 67 L.Ed.2d 207 (1981). A similar shifting of burdens occurs in a disparate impact case. Once a prima facie case is established, the employer may rebut it by showing that the practice complained of is required by “business necessity,” or has “a manifest relationship to the employment in question.” If the employer makes this showing, the plaintiff may still prevail by showing that the employer relied on the practice as a pretext for discrimination. Connecticut v. Teal, 457 U.S. 440, 446-47, 102 S.Ct. 2525, 2530-31, 73 L.Ed.2d 130 (1982), quoting Griggs, 401 U.S. at 432, 91 S.Ct. at 854.
III.
The district court acknowledged that Ms. Lynch was proceeding under both theories and treated her claims separately.
A.
The court found no evidence, either direct or circumstantial, from which it could conclude that TVA intentionally discriminated against the plaintiff. Its ultimate finding was that Ms. Lynch was fired for violation of Rule 7 and insubordination, both legitimate, nondiscriminatory reasons. The court rejected as not credible the testimony of male co-workers that they had entered the powerhouse openly and had not been disciplined, and noted that 23 other construction workers had received warning letters for Rule 7 violations related to use of the powerhouse. These workers were not discharged, the court found, because they heeded the warnings. While the court found some evidence that on occasion the plaintiff was treated more harshly than other employees in the application of Rule 7, there was no proof that this treatment occurred because the plaintiff is a woman.
The plaintiff also attempted to establish disparate treatment by evidence other than that related to the enforcement of work rules. The court ruled that plaintiffs attempt to establish a discriminatory motive on the basis of the relatively small number of female construction workers hired by TVA at the Cumberland City site did not meet recognized standards for statistical proof. The plaintiff also produced testimony that James Fogg watched her more closely than he did the other apprentices and appeared to resent her being part of his crew. The district court examined this evidence and found that there was no proof that any antipathy Mr. Fogg might have displayed toward the plaintiff was based on her sex.
In rejecting the claim of disparate treatment the district court did not explicitly rule on whether the plaintiff had made out a prima facie case, but simply ruled that she had failed to carry the ultimate burden of persuasion on the issue of discriminate*384ry intent. In other words, it accepted TVA’s reasons for the plaintiff’s discharge. This procedure was approved by the Supreme Court in Postal Service v. Aikens:
Where the defendant' has done everything that would be required of him if the plaintiff had properly made out a prima facie case, whether the plaintiff really did so is no longer relevant. The district court has before it all the evidence it needs to decide whether “the defendant intentionally discriminated against the plaintiff.” Burdine, supra, [450 U.S.] at 253 [101 S.Ct. at 1093].
460 U.S. at 715, 103 S.Ct. at 1481.
B.
The district court proceeded somewhat differently in treating the disparate impact claim. It made extensive findings with respect to the conditions of the portable toilets, the effect of these conditions on the plaintiff, and their effect on women generally. In the end, however, the court concluded that these conditions “do not impose a ‘substantial burden’ on women that men need not suffer,” citing Nashville Gas Co. v. Satty, 434 U.S. 136, 142, 98 S.Ct. 347, 351, 54 L.Ed.2d 356 (1977). On the basis of this determination the district court concluded that the plaintiff had failed to establish a prima facie case of discrimination under Title VII. Although there was a full trial, TVA offered no evidence of business necessity, relying throughout on its position that Ms. Lynch proved no discrimination.
The principal findings of the district court with respect to disparate impact follow:
TVA had a contract with Modem Portable Buildings to provide the toilets and to maintain them in a sanitary condition complete with toilet tissue and paper seat covers. The evidence reveals that the service was sometimes poor. The toilets were cleaned twice weekly, a frequency which is generally sufficient for such toilets. The cleaning was accomplished by pumping out the sewage. This process often left the toilets messy, with human feces on the floors, walls, and even on the seats. The contractors were to scrub down the toilets afterward, but it appears that they often failed to do so. Paper covers were not provided, and the toilet paper, if any, was sometimes wet and/or soiled with urine. Furthermore, no running water for washing one’s hands was available near the toilets, although a chemical hand cleaner could be checked-out from the “gang-boxes.”
******
On balance, the Court finds it credible that most women were inhibited from using the portable toilets. Further, the Court finds that the inhibitions described were not personal peculiarities, but that plaintiff and others reasonable [sic] believed that the toilets could endanger their health.
******
Plaintiff introduced credible medical expert testimony to demonstrate that women are more vulnerable to urinary tract infections than are men.
* / * * * * *
On the basis of the medical evidence, the Cóurt concludes that an increased danger^f urinary tract infections may be linked to the practice of females holding their urine and to the use of toilets under the circumstances where the female’s bacteria-contaminated hands came into contact with her external genitalia or where a female’s perineal area comes into direct contact with bacteria-contaminated surfaces.
In rejecting TVA’s contention that Ms. Lynch had failed to establish a prima facie case because she produced no statistical evidence of a widespread impact, the district court stated, in a footnote:
In this case, only two women testified that they had used the toilets without any problems or fears. In statistical terms, which are admittedly nearly meaningless in a small group such as this, over two-thirds of the women were affected. More significantly, the defendants’ argument is misplaced because, whether they complained or not, all females were placed at a higher risk of *385urinary tract infections by using unsanitary portable toilets or by avoiding the use use of such toilets and holding their urine.
IV.
The plaintiff contends that the district court committed both legal and factual errors in concluding that she did not show that TVA’s proffered reasons for discharging her were pretextual. She argues that her evidence of unequal enforcement of Rule 7 showed that she was not fired for violation of that rule. The district court erred as a matter of law, the plaintiff asserts, in refusing to consider the testimony of five male co-workers that they entered the powerhouse on occasion without being disciplined. Ms. Lynch argues that this uncontradicted evidence was not so improbable as to permit the district court to discount it completely. She also contends that the district court erred by refusing to consider whether supervisors other than James Fogg enforced disciplinary rules less strictly than Fogg enforced them in her case.
In his memorandum the district judge made a specific determination that the testimony of the co-workers was not credible, and gave reasons for this conclusion. Obviously, this court must accord great deference to the credibility determination of a trial judge who has observed the witnesses as they testified. Anderson v. City of Bessemer City, N.C., 470 U.S. 564, 105 S.Ct. 1504, 1512, 84 L.Ed.2d 518 (1985). Although the witnesses were not contradicted, the trial judge was aware of inconsistencies in their version of events, based on pretrial discovery. We can find no basis for overruling this credibility determination.
The trial judge may have erred in looking only to the actions of the plaintiff’s immediate supervisor, Mr. Fogg, rather than those of all TVA supervisors; however, any such error was harmless. The proffered evidence of leniency by other supervisors contained no element of proof that Fogg’s more severe treatment of the plaintiff resulted from intentional discrimination on the basis of sex. As the court pointed out, James Fogg may have disliked the plaintiff for reasons totally unrelated to the fact that she is a woman, and the evidence of difference in treatment was far from conclusive.
The plaintiff makes a separate claim of disparate treatment under the rubric “constructive discharge.” This court has recognized the doctrine of constructive discharge, both in labor relations and civil rights cases. See Easter v. Jeep Corp., 750 F.2d 520, 522 (6th Cir.1984); Held v. Gulf Oil Co., 684 F.2d 427, 432 (6th Cir.1982); Jacobs v. Martin Sweets Co., 550 F.2d 364 (6th Cir.), cert. denied, 431 U.S. 917, 97 S.Ct. 2180, 53 L.Ed.2d 227 (1977), (all Title VII cases); NLRB v. Tennessee Packers, Inc., 339 F.2d 203 (6th Cir.1964), (labor case). The plaintiff contends that the district court committed reversible error in testing her constructive discharge claim by the standard stated in Muller v. United States Steel Corp., 509 F.2d 923 (10th Cir.), cert. denied, 423 U.S. 825, 96 S.Ct. 39, 46 L.Ed.2d 41 (1975), rather than that set out in the Sixth Circuit cases. Muller required a showing that the employer deliberately rendered the employee’s working conditions intolerable. The Sixth Circuit cases permit a finding of constructive discharge where an employer engages in conduct that has the reasonably foreseeable effect of causing the employee to feel compelled to quit.
The district court’s reference to Muller did not constitute reversible error. Under either the Muller test or the Sixth Circuit test, a determination of constructive discharge necessarily rests on a finding of discriminatory intent. The district court found no such intent and this finding is not clearly erroneous. Moreover, the plaintiff’s constructive discharge argument suffers from a more serious defect. The plaintiff was actually discharged; she did not resign. An employee who is actually discharged has no basis upon which to assert a claim of constructive discharge. The district court’s finding of no intentional discrimination disposed of the plaintiff’s claim *386of unlawful discharge under the disparate treatment theory.
The plaintiff’s arguments for reversal of the district court’s determination that she was not a victim of disparate treatment all seem designed to avoid the clearly erroneous standard of review. No matter how it is stated, her fundamental quarrel is with the district court’s conclusion that TVA did not intentionally treat her in a discriminatory manner because of her sex. She cannot avoid the fact that this conclusion is based on a purely factual finding of no intent. Since we have determined that this finding is not clearly erroneous, we have no grounds for reversing that holding of the district court.
V.
A.
After making the findings on the disparate impact claim that are set forth in III-B, the district court held that the plaintiff had not established a prima facie case. The district court explicitly recognized that the toilet facilities had an impact on female employees not experienced by male employees. However, the court concluded that these conditions did not “constitute a barrier to equal opportunities for women because the female construction workers could have eradicated the increased health danger by a few simple measures.” This being so, the district court determined that the unsanitary and inadequate toilet facilities did “not impose a ‘substantial burden’ on women that men need not suffer.”
The “few simple” measures available to the female employees were described by the district court as follows:
First of all, the use in general of the portable toilets poses no special risk to women. The use of dirty toilets constitutes an increased chance of urinary tract infections only when the female’s perineal area becomes contaminated with E. Coli bacteria either from direct contact with contaminated toilet paper or toilet seats or from contaminated hands coming in contact with the vaginal area. Thus, in order to avoid any increased risk to their health, the women need to avoid using soiled toilet paper, to avoid sitting directly on dirty seats, and to avoid inserting tampons when their hands may be dirty. To avoid using contaminated toilet paper, the female workers could have carried their own toilet paper to use if the toilet paper provided were dirty or missing. Plaintiff and several other women testified that at times they did carry their own toilet paper. To avoid contact with a contaminated toilet seat, the females could cover the dirty seat with toilet paper or could refrain from sitting directly on the seat. Furthermore, the contract with Modem Portable Buildings included the provision of paper seat covers. The women could have pursued better compliance with the contract. Lastly, to avoid the problems associated with tampon use, the women could have checked out the waterless hand cleaner. Alternatively, as several testified that they did successfully, the women could have sought permission to use the indoor powerhouse facilities during their menstrual periods. By adhering to these practices, the disproportionate impact of the toilets on women would disappear.
B.
The plaintiff argues that the district court misapplied the disparate impact theory in concluding that she failed to establish a prima facie case. The district court required her to prove more than a significant adverse impact and by imposing upon her the additional burden of taking steps to reduce the impact, “collapsed the shifting burden method of proof.” By establishing that the unsanitary facilities created a health hazard for women which was not experienced by the men on the job, the plaintiff contends she met her burden of proof, and the burden then shifted to TVA to prove “business necessity.” Since TVA offered no proof on this issue, Ms. Lynch argues that she was entitled to prevail as a matter of law.
TVA maintains that the district court correctly held that the plaintiff failed to make a prima facie case because the condi*387tion of the toilets was not subject to a disparate impact analysis. It contends that conditions of employment are dealt with in § 703(a)(1) of Title VII whereas § 703(a)(2) only forbids acts that deprive employees of opportunities by limiting, segregating or classifying them. TVA argues that § 703(a)(1) applies to disparate treatment cases and § 703(a)(2) to disparate impact cases, and that Ms. Lynch brought her disparate impact claim under the wrong section; that is, that claims based on conditions of employment must be brought, under § 703(a)(1).
TVA also asserts that since the facilities for men and women are equal, the plaintiff is contending that women must receive preferential treatment, which Title VII does not require. Finally, TVA states that “numerical disparity” is the key in a disparate impact case, and that the plaintiff failed to prove an adverse impact on the basis of statistically significant numbers.
VI.
A.
Sections 703(a)(1) and (2) of Title VII provide:
(a) It shall be an unlawful employment practice for an employer—
(1) to fail or refuse to hire or to discharge any individual, or otherwise to discriminate against any individual with respect to his compensation, terms, conditions, or privileges of employment, because of such individual’s race, color, religion, sex, or national origin; or
(2) to limit, segregate, or classify his employees or applicants for employment in any way which would deprive or tend to deprive any individual of employment opportunities or otherwise adversely affect his status as an employee, because of such individual's race, color, religion, sex, or national origin.
42 U.S.C. § 2000e-2(a)
We reject TVA’s argument that working conditions may never be the basis of disparate impact claims. The fact that the prohibited practices specified in § 703(a)(1) include* discriminatory conditions of employment and conditions are not mentioned in § 703(a)(2) does not mean that discriminatory conditions may not form the basis of a disparate impact claim. The Supreme Court has held that a disparate impact claim “reflects the language of § 703(a)(2)....” Connecticut v. Teal, 457 U.S. at 448, 102 S.Ct. at 2531. However, the language of § 703(a)(2) is clearly broad enough to include working conditions that have an adverse impact on a protected group of employees. It is an unlawful employment practice under § 703(a)(2) “to limit ... employees ... in any way which would deprive or tend to deprive any individual of employment opportunities or otherwise adversely affect his status as an employee, because of such individual’s ... sex.” The condition of the toilets did “limit” female CSB employees in a way that adversely affected their status as employees based solely on their sex. The district court properly considered the merits of the disparate impact claim based on working conditions that had an adverse effect on female employees not experienced by male co-workers.
The district court did not directly address TVA’s argument that since it furnished the same facilities to all employees, it cannot be held to have discriminated against the female employees. If this argument could prevail, there would be no disparate impact cases. The underlying premise of these cases is that the employer permits or requires “employment practices that are facially neutral in their treatment of different groups but that in fact fall more harshly on one group than another....” Chrisner v. Complete Auto Transit, 645 F.2d 1251, 1257 (6th Cir.1981). If apparent equality of facilities could shield an employer from Title VII liability the entire rationale of the disparate impact theory — based as it is on “consequences”— would be undercut. In these cases “discrimination results not from the decision to employ a challenged practice, but from its effect.” Id.
The district court also correctly ruled that the plaintiff was not required to prove her case by statistics. While Title *388VII plaintiffs may be able to prove some disparate impact cases by statistics, that is not the only avenue available. Both §§ 703(a)(1) and (a)(2) speak in terms of “any individual.” The focus of § 703(a)(1) is discriminatory treatment of any individual, and of § 703(a)(2) discriminatory consequences for any individual. The language of the statute does not support TVA’s argument.
We also reject TVA’s contention that the plaintiff did not raise her disparate impact claim administratively. As the district court found, the “scope” of the plaintiff’s EEOC complaint was sufficiently broad to include the disparate impact claim included in her judicial complaint.
B.
We believe the district court erred as a matter of law in holding that the plaintiff failed to make a prima facie case because the acknowledged uneven burden on women was not substantial. The evidentiary requirements of a prima facie case of discrimination are not onerous. Burdine, 450 U.S. at 253, 101 S.Ct. at 1093; Daniels v. Board of Education of the Ravenna City School District, 805 F.2d 203, 207 (6th Cir.1986). The purpose of § 703(a)(2) is to achieve equality of employment opportunities for women and members of minority groups by prohibiting practices that operate as “built in headwinds” for such people and have no relationship to job performance. Griggs, 401 U.S. at 432, 91 S.Ct. at 854. TVA argues that portable toilets have been approved by the commission established under the Occupational Health & Safety Act (OSHA) and that female employees must accept them as part of construction work. This misses the point. The issue is not the decision to use portable toilets — it is the failure to furnish adequate and sanitary facilities to female workers who have been shown to suffer identifiable health risks from using portable toilets in the deplorable conditions of those furnished by TVA at the Cumberland City construction site.
The district court found in favor of the plaintiff on every significant factual claim in her disparate impact case. It then concluded that the impact was not substantial because the plaintiff and other female workers could have alleviated the effect of the unsanitary facilities. We can find no legal basis for the district court’s approach. New concerns are more pressing to anyone than those related to personal health. A prima facie case is established when a plaintiff shows “that the facially neutral practice has a significantly discriminatory impact.” Connecticut v. Teal, 457 U.S. at 446, 102 S.Ct. at 2530. Any employment practice that adversely affects the health of female employees while, leaving male employees unaffected has a significantly discriminatory impact. The district court erred as a matter of law in concluding that Ms. Lynch failed to make out a prima facie case. The court found that “all females were placed at a higher risk of urinary tract infections by using unsanitary portable toilets or by avoiding the use of such toilets and holding their urine.” The court also found that men were not exposed to the same risks from using the toilets because of “anatomical differences between the sexes.” It was error, after the plaintiff had made out a prima facie case, to require anything else of her. The burden then shifted to TVA to justify the practice which resulted in this discriminatory impact by showing “business necessity,” that is, that the practice of furnishing unsanitary toilet facilities at the work site “substantially promote[s] the proficient operation of the business.” Chrisner v. Complete Auto Transit, 645 F.2d at 1262.
Title VII is remedial legislation which must be construed liberally to achieve its purpose of eliminating discrimination from the workplace. Parham v. Southwestern Bell Telephone Co., 433 F.2d 421, 425 (8th Cir.1970); Culpepper v. Reynolds Metals Co., 421 F.2d 888, 891 (5th Cir.1970). Although Ms. Lynch was discharged for violating a rule, she did so in order to avoid the continued risk to her health which would have resulted from obeying the rule. This employer created an unacceptable situation in which Ms. Lynch and other female construction workers were required *389to choose between submitting to a discriminatory health hazard or risking termination for disobeying a company rule. Anatomical differences between men and women are “immutable characteristics,” just as race, color and national origin are immutable characteristics. When it is shown that employment practices place a heavier burden on minority employees than on members of the majority, and this burden relates to characteristics which identify them as members of the protected group, the requirements of a Title VII disparate impact case are satisfied.
The plaintiff was entitled to judgment on her disparate impact claim. She established a prima facie case, and TVA made no attempt to prove business necessity, the “touchstone” in a disparate impact case. Griggs, 401 U.S. at 431, 91 S.Ct. at 853. The district court conducted a full trial on all issues, and TVA chose to defend solely on its assertion that there was no discrimination. Under these circumstances the court may “assume no justification exists.” Nashville Gas Co. v. Satty, 434 U.S. at 143, 98 S.Ct. at 352.
The judgment of the district court is reversed, and the case is remanded to the district court to determine the appropriate remedy for the violation found by this court. The plaintiff will recover costs on appeal.