40 CFR § 141.13 - Maximum contaminant levels for turbidity.
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.
The following state regulations pages link to this page.
- Alaska Admin. Code Title 18 § 80.010 - 18 AAC 80.010 - Requirements adopted by reference and other reference materials
- Alaska Admin. Code Title 18 § 80.305 - 18 AAC 80.305 - Compliance with MCL, treatment technique, and action level requirements
- Idaho Admin. Code r. 58.01.08.050 - 050 - MAXIMUM CONTAMINANT LEVELS AND MAXIMUM RESIDUAL DISINFECTANT LEVELS.
- N.H. Code Admin. R. Env-Dw 801.05 - Env-Dw 801.05 - Violations and Other Situations for Which Acute Public Notice is Required
- N.H. Code Admin. R. Env-Dw 801.08 - Env-Dw 801.08 - Standard Public Notice for Community Water Systems (CWS)
- N.H. Code Admin. R. Env-Dw 801.11 - Env-Dw 801.11 - Standard Public Notice for Non-Community Water Systems (NCWS)
- N.H. Code Admin. R. Env-Dw 804.04 - Env-Dw 804.04 - Required Health Effects Language for Turbidity Violations
- Wash. Admin. Code § 246-290-670 - 246-290-670 - Compliance requirements for existing unfiltered systems installing filtration.