Is Caldwell tap water safe to drink?

Yes with good quality

Caldwell'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
6.5 GPG
Hardness
Not detected
PFAS

1 Issue Detected in Caldwell

Arsenic Approaching Limit (0.2 mg/L)

EPA limit is 0.010 mg/L.

Arsenic info for Caldwell
Idaho

836,058,360,683,607 · Groundwater

Drinking Water in Caldwell: 2026 Analysis

Low Risk Updated March 2026 62,500 residents
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85
Purity Score

This 2026 water quality report for Caldwell compiles data from EPA SDWIS, EWG testing records, and the City of Caldwell Water consumer confidence report. Scores, contaminant levels, and matched filter recommendations are below.

Contaminant Levels

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

Health Insights

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

Score

85 /100
Excellent
"Good" threshold (70)

Caldwell tap water is sourced from Groundwater and treated by City of Caldwell Water. Overall purity score: 85/100 (Excellent). Updated for 2026.

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Explore Caldwell Water Data

Forever Chemicals in CaldwellPFAS water report
Lead Risk in CaldwellLead water report
Caldwell Hardness ReportScale and minerals
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Caldwell Water FAQ

Is Caldwell ID tap water safe to drink in 2026?
Caldwell 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 Caldwell ID use chlorine or chloramine for disinfection?
Caldwell uses chlorine as the primary disinfectant with a residual level of 0.7 ppm. Standard activated carbon filters including pitcher filters are effective at removing free chlorine taste and odor.
How hard is Caldwell ID water and what is the TDS level?
Caldwell water hardness is 6.5 grains per gallon (moderate) with a TDS of 260 ppm (fair). This level is unlikely to cause significant scale buildup in household plumbing.
Has PFAS been found in Caldwell ID drinking water?
Based on available EPA UCMR5 monitoring data as of 2026 PFAS have not been detected above EPA advisory levels in Caldwell drinking water.
What is the best water filter for Caldwell?
Based on Caldwell's water profile, we recommend the Clearly Filtered Water Pitcher. Caldwell 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 — 85/100NampaIdaho — 85/100MeridianIdaho — 85/100

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Data Sources

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

PurityMap compiles public data. Updated March 2026.

© 2026 PurityMap. For informational purposes only.

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