40 CFR §141.564
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.