Ariz. Admin. Code § R18-11-207 - Natural background

Where the concentration of a pollutant exceeds a water quality standard and the exceedance is caused solely by naturally occurring conditions, the exceedance shall not be considered a violation of the water quality standard.

Notes

Ariz. Admin. Code § R18-11-207
Former Section R9-21-207 repealed, former Section R9-21-204 renumbered and amended as Section R9-21-207 effective January 29, 1980 (Supp. 80-1). Former Section R9-21-207 renumbered as Section R9-21-206, former Section R9-21-208 renumbered as Section R9-21-207 and amended effective January 7, 1985 (Supp. 85-1). Former Section R9-21-207 renumbered without change as Section R9-21-208, former Section R9-21-206 renumbered and amended as Section R9-21-207 effective August 12, 1986 (Supp. 86-4). Former Section R9-21-207 renumbered without change as Section R18-11-207 (Supp. 87-3). Section repealed effective February 18, 1992 (Supp. 92-1). New Section made by final rulemaking at 29 A.A.R. 302, effective 2/20/2023.

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