Clovis, CA Water Quality Report

Is Clovis tap water safe? See PFAS and lead contamination levels for Clovis, California. Compare to EPA limits and get filter recommendations.

Quick Answers

Is Clovis, CA tap water safe to drink? Clovis, CA tap water meets most federal EPA limits, but PFAS compounds have been detected at an average of 7.86 ppt across 10 compounds. A certified pitcher filter or reverse osmosis system is recommended for sensitive populations.

What contaminants are in Clovis, CA water? Top PFAS compounds detected in Clovis water: PFOS (41 ppt), PFOA (18 ppt), PFHxS (8.8 ppt). See the full table for all monitored contaminants and comparison to EPA limits.

What filter should I use in Clovis, CA? An NSF/ANSI 58 reverse osmosis system is the strongest option, removing 90%+ of PFAS along with lead and arsenic. For renters or smaller households in Clovis, a pitcher certified to NSF-53 for PFAS (ZeroWater, PUR PLUS) is a practical alternative. Ordinary Brita cartridges are not certified for PFAS.

Clovis, CA Water Quality Summary

EPA testing has detected PFAS "forever chemicals" in Clovis, CA drinking water. Recent monitoring found a peak level of 41 ppt across 1 water system, representing an average of 7.86 ppt across 10 detected compounds. These levels come from individual EPA UCMR 5 water samples (2023-2025). The EPA's 4 ppt limit for PFOA and PFOS is enforced on a running annual average, so a sample above it shows real exposure but is not by itself a violation.

Contamination Level: MODERATE – Moderate contamination – PFAS detected at meaningful levels; filtration recommended.

Top Detected Compounds

  • PFOS: 41 ppt (exceeds EPA 4 ppt limit for PFOA/PFOS)
  • PFOA: 18 ppt (exceeds EPA 4 ppt limit for PFOA/PFOS)
  • PFHxS: 8.8 ppt (exceeds EPA 4 ppt limit for PFOA/PFOS)
  • PFPeA: 8.4 ppt (exceeds EPA 4 ppt limit for PFOA/PFOS)
  • PFHxA: 8 ppt (exceeds EPA 4 ppt limit for PFOA/PFOS)

Lead in Clovis, CA Water

EPA Lead and Copper Rule testing has recorded 15 lead samples for Clovis water systems, with a 90th-percentile high of 0.008 mg/L (within the EPA 0.015 mg/L action level). There is no safe level of lead for children; if your home was built before 1986, a certified NSF/ANSI 53 lead-removal filter is recommended.

EPA Violations in Clovis, CA

Clovis public water systems have 82 health-based EPA Safe Drinking Water Act violations on record, including Total Trihalomethanes (TTHM), Arsenic, Combined Uranium, Revised Total Coliform Rule, Total Coliform Rule. Health-based violations mean a contaminant exceeded its federal limit or required treatment was not applied.

About the Data

The numbers on this page are drawn from EPA UCMR5 monitoring (2023-2025), which covers about 10,000 public water systems nationwide, including those serving Clovis, CA's approximately 120,124 residents.

ZIP Codes Served

93611, 93612

What Clovis, California Residents Should Do

  1. Enter your exact ZIP code at knowyourexposure.com for address-level data
  2. Install an NSF/ANSI 58 reverse osmosis filter (removes 94-99% of PFAS)
  3. If you're in a high-exposure group (pregnant, young children), consider a PFAS home test kit
  4. Review the Consumer Confidence Report (CCR) your California utility publishes annually