40 CFR 141.564 - My system practices lime softening
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If your system utilizes lime softening, you may apply to the State for alternative turbidity exceedance levels for the levels specified in the table in § 141.563. You must be able to demonstrate to the State that higher turbidity levels are due to lime carryover only, and not due to degraded filter performance.
Title 40 published on 2013-07-01
no entries appear in the Federal Register after this date.