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Code of Federal Regulations Title 40. Protection of Environment § 40.141.551 What strengthened combined filter effluent turbidity limits must my system meet?

Current as of January 02, 2025 | Updated by Findlaw Staff

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.
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Cite this article: FindLaw.com - Code of Federal Regulations Title 40. Protection of Environment § 40.141.551 What strengthened combined filter effluent turbidity limits must my system meet? - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-40-protection-of-environment/cfr-sect-40-141-551/

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