40 C.F.R. § 141.13

Maximum contaminant levels for turbidity

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The maximum contaminant levels for turbidity are applicable to both community water systems and non-community water systems using surface water sources in whole or in part. The maximum contaminant levels for turbidity in drinking water, measured at a representative entry point(s) to the distribution system, are:

(a) One turbidity unit (TU), as determined by a monthly average pursuant to § 141.22, except that five or fewer turbidity units may be allowed if the supplier of water can demonstrate to the State that the higher turbidity does not do any of the following:

(1) Interfere with disinfection;

(2) Prevent maintenance of an effective disinfectant agent throughout the distribution system; or

(3) Interfere with microbiological determinations.

(b) Five turbidity units based on an average for two consecutive days pursuant to § 141.22.

[40 FR 59570, Dec. 24, 1975]

Notes of Decisions

Cited in 4 cases, 1988–2001 · leading case: United States of Am., Plaintiff-Appellant(98-6609/6633)/cross-Appellee v. John David White, 270 F.3d 356 (6th Cir. 2001).

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United States of Am., Plaintiff-Appellant(98-6609/6633)/cross-Appellee v. John David White, 270 F.3d 356 (6th Cir. 2001). “Regulations enforcing the Act set maximum drinking water contaminant levels for turbidity separate from those for any other regulated contaminant, see 40 C.F.R. § 141.13 , distinguish turbidity from other contaminants in a number of other respects, see 40 C.”

United States v. City of North Adams, MA, 777 F. Supp. 61 (D. Mass. 1991). · cites it 8× “40 C.F.R. §§ 141.13 and 141.14. The complaint further alleges that North Adams failed to monitor the drinking water that it supplied to North Adams residents.”

United States v. Gerald Wright, 988 F.2d 1036 (10th Cir. 1993). “§§ 300g, 300g-l(b)(l), 300f(3); 40 C.F.R. §§ 141.13 , 141.22, and 141.31 (1992).”

United States v. Midway Heights Cnty. Water Dist., 695 F. Supp. 1072 (E.D. Cal. 1988). “14 ) and for turbidity ( 40 C.F.R. § 141.13 ), as determined by testing performed by the State of California on at least a monthly basis during 1987.”

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