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40 CFR 141.534

§ 141.534 How does my system use this data to calculate an inactivation ratio?

United States · 40 CFR — Protection of Environment · Status: effective

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40 CFR 141.534, § 141.534 How does my system use this data to calculate an inactivation ratio?, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/182013
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Use the tables in § 141.74(b)(3)(v) to determine the appropriate CT99.9 value. Calculate the total inactivation ratio as follows, and multiply the value by 3.0 to determine log inactivation of Giardia lamblia:

Legislative history

This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.