Enter your ZIP code to see real EPA data about contaminants, violations, and safety concerns, explained in plain English.
Safety Grade
We compute an overall water quality grade based on violations and health risks, not just legal compliance.
Health Context
Every contaminant comes with plain-English health effects, who's most at risk, and what to do.
Violation History
See every time your water exceeded legal limits or missed required testing, up to 10 years back.
Recommendations
Get specific, actionable suggestions: a filter type, a test kit, or nothing at all.
About this data: ClearWater uses the EPA's Safe Drinking Water Information System (SDWIS). Data is for public water systems only; private wells are not included. Legal limits (MCLs) are minimum standards; some contaminants may still pose health risks below legal thresholds.
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Water systems near
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CALDWELL CITY OF
CALDWELL, ID · 74,000 people served · Groundwater
Data last updated: 2026-07-11
98 total violations on record. No currently active health-based violations.
Lead & Copper
EPA has no lead or copper 90th-percentile results on record for this system.
Lithium
Highest reported detection: 16 µg/L. EPA's non-regulatory Health Reference Level is 10 µg/L. This system's highest detection is above that reference level.
Lithium has no federal drinking water limit. The Health Reference Level is a non-regulatory screening value from EPA's CCL 5 process, not an enforceable standard, and a result above it is not a violation. The figure shown is the highest single detection reported for this system; EPA compares averages, not maxima, when it reports national statistics. Source: EPA UCMR 5 occurrence data, reference values from EPA's UCMR 5 Data Summary (January 2026), Table 2.
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CALDWELL CITY OF: Frequently Asked Questions
Is CALDWELL CITY OF water safe to drink?
CALDWELL CITY OF has had multiple health-based violations in recent years (grade C). Review the specific violations below and consider filtering your drinking water.
What violations has CALDWELL CITY OF had?
CALDWELL CITY OF has 98 total violations on record, but none are currently active health-based violations.
Does CALDWELL CITY OF water have lead?
Lead in drinking water typically comes from household plumbing, not from CALDWELL CITY OF's treatment plant. See the Lead & Copper section on this page for the most recent 90th-percentile lead test results. If your home was built before 1986, consider running cold water for 30 seconds before drinking and using an NSF/ANSI 53-certified filter.
Related water quality pages
Lead & Copper
What To Do
Violations
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