| http://www.w3.org/ns/prov#value | - nd the highest source water lead concentration is less than the Practical Quantitation Level for lead specified in ??141.89(a)(1)(ii).(i) Those systems whose highest source water lead level is below the Method Detection Limit may also be deemed to have optimized corrosion control under this paragraph if the 90th percentile tap water lead level is less than or equal to the Practical Quantitation Le
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