40 CFR 141.551 - What strengthened combined filter effluent turbidity limits must my system meet?

§ 141.551 What strengthened combined filter effluent turbidity limits must my system meet?
Your system must meet two strengthened combined filter effluent turbidity limits.
(a) The first combined filter effluent turbidity limit is a “95th percentile” turbidity limit that your system must meet in at least 95 percent of the turbidity measurements taken each month. Measurements must continue to be taken as described in § 141.74(a) and (c). Monthly reporting must be completed according to § 141.570. The following table describes the required limits for specific filtration technologies.
If your system consists of * * * Your 95th percentile turbidity value is * * *
(1) Conventional Filtration or Direct Filtration 0.3 NTU.
(2) All other “Alternative” Filtration A value determined by the State (not to exceed 1 NTU) based on the demonstration described in § 141.552.
(b) The second combined filter effluent turbidity limit is a “maximum” turbidity limit which your system may at no time exceed during the month. Measurements must continue to be taken as described in § 141.74(a) and (c). Monthly reporting must be completed according to § 141.570. The following table describes the required limits for specific filtration technologies.
If your system consists of * * * Your maximum turbidity value is * * *
(1) Conventional Filtration or Direct Filtration 1 NTU.
(2) All other “Alternative Filtration” A value determined by the State (not to exceed 5 NTU) based on the demonstration as described in § 141.552.
[67 FR 1839, Jan. 14, 2002, as amended at 69 FR 38856, June 29, 2004]

Title 40 published on 2014-07-01

no entries appear in the Federal Register after this date.

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United States Code

Title 40 published on 2014-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR 141 after this date.

  • 2014-11-13; vol. 79 # 219 - Thursday, November 13, 2014
    1. 79 FR 67408 - Notice of Public Meeting and Webinar: Preliminary Regulatory Determinations for the Third Contaminant Candidate List
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      ENVIRONMENTAL PROTECTION AGENCY
      Notice of public meeting on potential rulemaking.
      The public meeting and webinar will be held on Tuesday, December 9, 2014, from 1 p.m. to 5 p.m., eastern time. Persons wishing to attend the meeting in person or online via webinar must register by December 2, 2014, as described in the SUPPLEMENTARY INFORMATION section.
      40 CFR Part 141