Nampa, ID Water Quality Report

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

Quick Answers

Is Nampa tap water safe to drink? Nampa tap water meets most federal EPA limits, but PFAS compounds have been detected at an average of 20.2 ppt across 1 compound. A certified pitcher filter or reverse osmosis system is recommended for sensitive populations.

What contaminants are in Nampa water? Top PFAS compounds detected in Nampa water: lithium (42.1 ppt). See the full table for all monitored contaminants and comparison to EPA limits.

What filter should I use in Nampa? Reverse osmosis removes 90%+ of PFAS, lead, and arsenic. NSF-53 certified pitcher and faucet filters (ZeroWater, Clearly Filtered, LifeStraw) work for smaller households. Skip standard Brita filters for PFAS removal.

Nampa Water Quality Summary

EPA testing has detected PFAS "forever chemicals" in Nampa drinking water. Recent monitoring found a peak level of 42.1 ppt across 1 water system, representing an average of 20.2 ppt across 1 detected compound.

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

Top Detected Compounds

  • lithium: 42.1 ppt (exceeds EPA 4 ppt limit for PFOA/PFOS)

Lead in Nampa Water

EPA Lead and Copper Rule testing has recorded 140 lead samples for Nampa water systems, with a 90th-percentile high of 0.023 mg/L (above 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 Nampa

Nampa public water systems have 34 health-based EPA Safe Drinking Water Act violations on record, including Chromium, Gross Alpha (excl. radon & uranium), Lead & Copper Rule, Surface Water Treatment Rule, Lead. Health-based violations mean a contaminant exceeded its federal limit or required treatment was not applied.

About the Data

These figures come from the EPA's Unregulated Contaminant Monitoring Rule 5 (UCMR5) testing program, 2023-2025. UCMR5 is the most comprehensive national drinking water survey in US history, covering 66,000+ public water systems. Population of Nampa: approximately 100,200.

ZIP Codes Served

83651, 83686, 83687

Compare Nampa to Other Cities

Side-by-side PFAS contamination comparisons with same-state, regional, and national peers.

What Nampa 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 your utility's Consumer Confidence Report (CCR) annually