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The Pennsylvania Code website reflects the Pennsylvania Code changes effective through 54 Pa.B. 2336 (April 27, 2024).

25 Pa. Code § 93.4a. Antidegradation.


§ 93.4a. Antidegradation.

 (a)  Scope. This section applies to surface waters of this Commonwealth.

 (b)  Existing use protection for surface waters. Existing instream water uses and the level of water quality necessary to protect the existing uses shall be maintained and protected.

 (c)  Protection for High Quality Waters—The water quality of High Quality Waters shall be maintained and protected, except as provided in §  93.4c(b)(1)(iii) (relating to implementation of antidegradation requirements).

 (d)  Protection for Exceptional Value Waters—The water quality of Exceptional Value Waters shall be maintained and protected.


   The provisions of this §  93.4a issued under sections 5(b)(1) and 402 of The Clean Streams Law (35 P. S. § §  691.5(b)(1) and 691.402); and section 1920-A of The Administrative Code of 1929 (71 P. S. §  510-20).


   The provisions of this §  93.4a adopted July 16, 1999, effective July 17, 1999, 29 Pa.B. 3720.

Cross References

   This section cited in 25 Pa. Code §  96.3 (relating to water quality protection requirements).

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