States ›Idaho ›Canyon County ›Nampa

Nampa, ID Tap Water Quality 2026

Water quality report for Nampa, ID — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Nampa's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Nampa City Of PWSID: ID3140080 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 2.00 ppb, 13% of the action level and no violations are open. No PFAS was detected.

B

Nampa earns a B for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 2.00 ppb — 13% of the federal action level
PFAS tested, none detected
80 violations since 2015, 0 health-based
No violations currently open
Nampa's lead level vs. all Idaho community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 2.00 ppb — 13% of the federal action level
✓ Lower lead than 75% of Idaho utilities
Population Served
99822
~38361 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
80 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
13% of EPA action level
2.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 2.00 ppb, 13% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2023 Resolved
Endrin MONITORING AND REPORTING — 0.002 mg/L 2020–2022 Archived
BHC-GAMMA MONITORING AND REPORTING — 0.0002 mg/L 2020–2022 Archived
Methoxychlor MONITORING AND REPORTING — 0.04 mg/L 2020–2022 Archived
Toxaphene MONITORING AND REPORTING — 0.003 mg/L 2020–2022 Archived
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2020–2022 Archived
Diquat MONITORING AND REPORTING — 0.02 mg/L 2020–2022 Archived
Endothall MONITORING AND REPORTING — 0.1 mg/L 2020–2022 Archived
Glyphosate MONITORING AND REPORTING — 0.7 mg/L 2020–2022 Archived
Di(2-ethylhexyl) adipate MONITORING AND REPORTING — 0.4 mg/L 2020–2022 Archived
OXAMYL MONITORING AND REPORTING — 0.2 mg/L 2020–2022 Archived
Simazine MONITORING AND REPORTING — 0.004 mg/L 2020–2022 Archived
Di(2-ethylhexyl) phthalate MONITORING AND REPORTING — 0.006 mg/L 2020–2022 Archived
Picloram MONITORING AND REPORTING — 0.5 mg/L 2020–2022 Archived
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2020–2022 Archived
Hexachlorocyclopentadiene MONITORING AND REPORTING — 0.05 mg/L 2020–2022 Archived
Carbofuran MONITORING AND REPORTING — 0.04 mg/L 2020–2022 Archived
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2020–2022 Archived
LASSO MONITORING AND REPORTING — — 2020–2022 Archived
Heptachlor MONITORING AND REPORTING — 0.0004 mg/L 2020–2022 Archived
Heptachlor epoxide MONITORING AND REPORTING — 0.0002 mg/L 2020–2022 Archived
2,4-D MONITORING AND REPORTING — 0.07 mg/L 2020–2022 Archived
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2020–2022 Archived
HEXACHLOROBENZENE MONITORING AND REPORTING — 0.001 mg/L 2020–2022 Archived
Benzo(a)pyrene MONITORING AND REPORTING — 0.0002 mg/L 2020–2022 Archived
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2020–2022 Archived
Total Polychlorinated Biphenyls (PCB) MONITORING AND REPORTING — 0.0005 mg/L 2020–2022 Archived
1,2-DIBROMO-3-CHLOROPROPANE MONITORING AND REPORTING — 0.0002 mg/L 2020–2022 Archived
ETHYLENE DIBROMIDE MONITORING AND REPORTING — 0.00005 mg/L 2020–2022 Archived
Chlordane MONITORING AND REPORTING — 0.002 mg/L 2020–2022 Archived
Endrin MONITORING AND REPORTING — 0.002 mg/L 2020–2022 Archived
BHC-GAMMA MONITORING AND REPORTING — 0.0002 mg/L 2020–2022 Archived
Methoxychlor MONITORING AND REPORTING — 0.04 mg/L 2020–2022 Archived
Toxaphene MONITORING AND REPORTING — 0.003 mg/L 2020–2022 Archived
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2020–2022 Archived
Diquat MONITORING AND REPORTING — 0.02 mg/L 2020–2022 Archived
Endothall MONITORING AND REPORTING — 0.1 mg/L 2020–2022 Archived
Glyphosate MONITORING AND REPORTING — 0.7 mg/L 2020–2022 Archived
Di(2-ethylhexyl) adipate MONITORING AND REPORTING — 0.4 mg/L 2020–2022 Archived
OXAMYL MONITORING AND REPORTING — 0.2 mg/L 2020–2022 Archived
Simazine MONITORING AND REPORTING — 0.004 mg/L 2020–2022 Archived
Di(2-ethylhexyl) phthalate MONITORING AND REPORTING — 0.006 mg/L 2020–2022 Archived
Picloram MONITORING AND REPORTING — 0.5 mg/L 2020–2022 Archived
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2020–2022 Archived
Hexachlorocyclopentadiene MONITORING AND REPORTING — 0.05 mg/L 2020–2022 Archived
Carbofuran MONITORING AND REPORTING — 0.04 mg/L 2020–2022 Archived
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2020–2022 Archived
LASSO MONITORING AND REPORTING — — 2020–2022 Archived
Heptachlor MONITORING AND REPORTING — 0.0004 mg/L 2020–2022 Archived
Heptachlor epoxide MONITORING AND REPORTING — 0.0002 mg/L 2020–2022 Archived
2,4-D MONITORING AND REPORTING — 0.07 mg/L 2020–2022 Archived
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2020–2022 Archived
HEXACHLOROBENZENE MONITORING AND REPORTING — 0.001 mg/L 2020–2022 Archived
Benzo(a)pyrene MONITORING AND REPORTING — 0.0002 mg/L 2020–2022 Archived
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2020–2022 Archived
Total Polychlorinated Biphenyls (PCB) MONITORING AND REPORTING — 0.0005 mg/L 2020–2022 Archived
1,2-DIBROMO-3-CHLOROPROPANE MONITORING AND REPORTING — 0.0002 mg/L 2020–2022 Archived
ETHYLENE DIBROMIDE MONITORING AND REPORTING — 0.00005 mg/L 2020–2022 Archived
Chlordane MONITORING AND REPORTING — 0.002 mg/L 2020–2022 Archived
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2020–2022 Archived
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2020–2022 Archived
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2020–2022 Archived
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2020–2022 Archived
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2020–2022 Archived
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2020–2022 Archived
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2020–2022 Archived
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2020–2022 Archived
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2020–2022 Archived
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2020–2022 Archived
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2020–2022 Archived
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2020–2022 Archived
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2020–2022 Archived
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2020–2022 Archived
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2020–2022 Archived
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2020–2022 Archived
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2020–2022 Archived
Benzene MONITORING AND REPORTING — 0.005 mg/L 2020–2022 Archived
Toluene MONITORING AND REPORTING — 1 mg/L 2020–2022 Archived
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2020–2022 Archived
Styrene MONITORING AND REPORTING — 0.1 mg/L 2020–2022 Archived
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

80 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Nampa City Of
PWSID ID3140080
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 99,822
Service connections 38,361
Systems serving this area 16
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Nampa tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 2.00 ppb, 13% of the action level.
Does Nampa water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Nampa? ▼
Nampa City Of (PWSID ID3140080), one of 16 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2022-05-24. Inspectors recorded 4 significant deficiencies.

What Should Nampa Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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