Is Nampa tap water safe to drink?

Yes with good quality

Nampa's tap water meets all EPA standards and scores well on our analysis. It is generally safe to drink though filtration can improve taste and provide extra precaution.

85/100
Purity Score
1
Issues Found
5.2 GPG
Hardness
Not detected
PFAS

1 Issue Detected in Nampa

Arsenic Approaching Limit (0.2 mg/L)

EPA limit is 0.010 mg/L.

Arsenic info for Nampa
Idaho

836,518,365,383,686 · Boise River and Snake River Plain Aquifer

Nampa, ID: Water Quality and Filter Guide

Low Risk Updated March 2026 99,321 residents
See Best Filters for Nampa
85
Purity Score

Residents of Nampa draw from Boise River and Snake River Plain Aquifer infrastructure managed by City of Nampa Water. This 2026 analysis evaluates safety, identifies any concerns, and recommends the best home filtration options.

Contaminant Levels

PFAS
ND
Lead
1.2 ppb
Nitrate
0.8 mg/L
Arsenic
0.2 mg/L
Hardness
5.2 gpg

Health Insights

  • 1
    Nampa's water meets current EPA standards. Filtration can improve taste and provide extra safety.

Score

85 /100
Excellent
"Good" threshold (70)

Nampa tap water is sourced from Boise River and Snake River Plain Aquifer and treated by City of Nampa Water. Overall purity score: 85/100 (Excellent). Updated for 2026.

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Best filters matched to Nampa's 1 issue.

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Explore Nampa Water Data

PFAS Levels in NampaPFAS testing data
Nampa Lead LevelsLead testing data
Water Hardness in NampaHardness levels
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Nampa Water FAQ

Is Nampa ID tap water safe to drink in 2026?
Nampa tap water meets EPA federal drinking water standards and scores 85/100 (Excellent) on PurityMap for 2026. For most healthy adults the water is considered safe but point-of-use filtration adds an important layer of protection.
Does Nampa ID use chlorine or chloramine for disinfection?
Nampa uses chlorine as the primary disinfectant with a residual level of 0.8 ppm. Standard activated carbon filters including pitcher filters are effective at removing free chlorine taste and odor.
How hard is Nampa ID water and what is the TDS level?
Nampa water hardness is 5.2 grains per gallon (moderate) with a TDS of 200 ppm (fair). This level is unlikely to cause significant scale buildup in household plumbing.
Has PFAS been found in Nampa ID drinking water?
Based on available EPA UCMR5 monitoring data as of 2026 PFAS have not been detected above EPA advisory levels in Nampa drinking water.
What is the best water filter for Nampa?
Based on Nampa's water profile, we recommend the Clearly Filtered Water Pitcher. Nampa water scores well overall. A pitcher filter provides extra precaution and improves taste for drinking and cooking.

Nearby Reports

Idaho FallsIdaho — 81/100Twin FallsIdaho — 81/100PocatelloIdaho — 82/100BoiseIdaho — 85/100MeridianIdaho — 85/100CaldwellIdaho — 85/100

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Data Sources

  • EPA SDWIS
  • EWG Tap Water Database
  • City of Nampa Water CCR
  • USGS monitoring data

PurityMap compiles public data. Updated March 2026.

© 2026 PurityMap. For informational purposes only.

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