On March 30, 1971, the Board of County Commissioners of Dade County, Florida adopted an ordinance amending its Municipal Code by adding Section 24-44.1 That ordinance, as now modified, required that every product within the definition 2 of detergent or synthetic detergent must bear a label showing the ingredients of the product, listed in descending order of their presence by weight. CSMA3 consists of manufacturers and marketers of products falling within the scope of the ordinance. Their basic premise is that Congress preempted this field of regulation through the 1966 Amendments to the Federal Hazardous Substances Act (FHSA), 15 U.S.C.A. § 1261. Thus, they seek a declaratory judgment that the Dade County ordinance is invalid.
In analyzing the question of federal preemption of an area admittedly the legitimate subject of state regulation, it is first necessary to determine in what possible contexts the question may arise. In so doing we implicitly acknowledge the supremacy of federal law wherever conflict is actually found, U.S.C.A. Const. Art. VI, Clause 2. Ordinarily, there are three possible events which occur when a state regulation (or local ordinance as the case is here) stands side-by-side with a federal law on the same topic: (i) the local ordinance may be in direct conflict with the federal law, in which case the state law must yield, (ii) the local rule may coincide or substantially imitate the federal law, a situation which may be desirable if concurrent enforcement is the congressional policy, or *327(iii) the ordinance may supplement the federal law and thereby extend or increase the degree of regulation.
*326Any cleaning compound which is available for household use, laundry use or industrial use, which is composed of organic and inorganic compounds including soaps, water softeners, surface active agents, dispersing agents, foaming-agents, buffering agents, builders, fillers, dyes, enzymes, and fabric softeners, whether in the forms of crystals, powders, flakes, bars, liquids, sprays or any other form. [Municipal Code of Metropolitan Dade County § 24-44(1) (a)]
*327It is this final category which has traditionally presented the most difficulty. For where Congress has chosen to “occupy” a field, but has not undertaken to regulate every aspect of that area, the states have the implied reservation of power to fill out the scheme. Florida Lime & Avocado Growers, Inc. v. Paul, 1963, 373 U.S. 132, 142, 83 S.Ct. 1210, 1217, 10 L.Ed.2d 248, 257.
Of course, Congress may anticipate this logic and attach an express preemption clause to the regulatory legislation, thereby prohibiting any further action of a supplemental nature by the states or their political subdivisions, Florida Lime & Avocado Growers, Inc. v. Paul, supra. In this instance, preemption applies even though there is no direct conflict between the federal law and the state/loeal ordinance. Congress has done so in the 1966 amendments to FHSA4 as the legislative history5 expressly reflects.
Given this clear expression of congressional intent to create some form of preemption, the only thing left for us is to determine whether the meaning of the term “precautionary labeling” is sufficiently broad to encompass the words of the ordinance. If so, the ordinance must yield.
In Chemical Specialties Manufacturers Association v. Lowery, 2 Cir., 1971, 452 F.2d 431, 437-438, the Court was concerned with the effects of New York City Fire Department regulations governing the distribution and labeling of aerosol or pressurized containers. It said:
Any restricted reading of “precautionary labeling” not to include such additional labeling as is required under the City Regulations would implicitly suggest that Congress was not concerned with the burdening of interstate commerce, a position clearly re*328futed by this legislative history; the flow of commerce in products within the FHSA free of differing labeling requirements was clearly of foremost concern to Congress in enacting the preemption provision. Such a concern would not be served by restricting the express preemption provision to cautionary labeling and sanctioning a proliferation of local requirements with respect to identification labeling. Compare Campbell v. Hussey, 368 U.S. 297, 82 S.Ct. 327, 7 L.Ed.2d 299 (1961). In sum, the evidence is strong that Congress used the phrase “precautionary labeling” in the preemption provision in the broad sense of all labeling of hazardous substances covered by the FHSA.
We agree.
Finding no conflict between the Dade County ordinance and FHSA the trial Judge upheld the ordinance. We reverse.
Reading the plain words of the 1966 Amendment to FHSA in light of their legislative history, H.R.Rep.No. 2166, 89 Cong.2d Sess. 6 (1966), and the obvious desirability of a uniform Federal standard, we hold that the Dade County regulation must give way to the supremacy of Federal law. See Chemical Specialties Manufacturers Association, Inc. v. Lowery, supra.
Reversed and remanded.
. The ordinance defines “detergent and synthetic detergent as follows :
. A preliminary question of standing of the CSMA to represent its members has been raised by the association’s own brief. However, Dade County does not challenge the right of CSMA to conduct the suit or this appeal. We agree that CSMA has a sufficient stake in the outcome of this case to assure a spirited, adversarial presentation of the issues. See National Automatic Laundry and Cleaning Council v. Shultz, 1971, 143 U.S.App.D.C. 274, 443 F.2d 689, 693-694.
. In the 1966 Amendment to the Act Congress specifically spelled out the effect that the Federal law was to have on incongruous state regulations:
Effect Upon Federal & State Law It is hereby expressly declared that it is the intent of the Congress to supersede any and all laws of the States and political subdivisions thereof insofar as they may now or hereafter provide for the precautionary labeling of any substance or article intended or suitable for household use (except for those substances defined in sections 2(f) (2) and (3) of this Act) which differs from the requirements or exemptions of this Act or the regulations or interpretations promulgated pursuant thereto. Any law, regulation, or ordinance purporting to establish such a labeling requirement shall be null and void.
Child Protection Act of 1966, Pub.L. No. 89-756 (November 3, 1966), Section 4, 89 Stat. 1303, 1305, (Emphasis supplied).
Preemption is also claimed on the basis of the provisions of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), 7 U.S.C.A. § 135. But at oral argument it was conceded by Dade County that the portion of the ordinance which restricted substances controlled by FIFRA were invalid, due to revisions by Congress of that statute. These new provisions became effective October 21, 1972.
A scheme of regulation has been adopted under the authority of these acts. The Food and Drug Administration has promulgated regulations under FHSA, found in 21 O.F.R. § 191. The Environmental Protection Agency administers FIFRA through regulations found in 40 O.F.R. § 162.
. This purpose is clearly expressed in the legislative history of the Amendments.
This Section would add a limited preemption amendment to the act. The amendment would supersede any State or local- precautionary labeling laws which differ from the requirements of the Federal act. This would free marketers of products sold interstate from the impractical and unnecessary burden of labeling each such product specially to comply with the requirements developed by States and cities during the years when there was no applicable Federal law, but at the same time it would permit and encourage States to adopt requirements identical with the Federal requirements and to enforce them to complement Federal enforcement.
H.R.Rep.No.2166, 89th Cong., 2d Sess. 6, U.S.Code Cong. & Admin.News 1966, pp. 4095, 4100 (1966).