What's in your
tap water?
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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Fetching from the Safe Drinking Water Information System
Water systems near
Select the utility that serves your address. Check your water bill if you're unsure.
COLTON, CITY OF
COLTON, CA · 46,525 people served · Groundwater
Data last updated: 2026-04-30
0 total violations on record. No currently active health-based violations.
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PFAS / Forever Chemicals
EPA UCMR5 monitoring data (2023–2025). 6 PFAS compounds detected.
| Compound | Detected | EPA MCL | Status |
|---|---|---|---|
| PFOS | 0.018 µg/L | 0.004 µg/L | OVER LIMIT |
| PFBS | 0.01 µg/L | - | No federal MCL |
| PFOA | 0.0059 µg/L | 0.004 µg/L | OVER LIMIT |
| PFHxS | 0.0051 µg/L | 0.01 µg/L | Within limit |
| PFPeA | 0.0045 µg/L | - | No federal MCL |
| PFHxA | 0.0035 µg/L | - | No federal MCL |
Source: EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR5). MCLs finalized April 2024. Values shown are the maximum detected concentration across all sampling events.
Water Hardness
Estimated based on USGS geological survey data for your county.
Source: USGS National Water Information System. Hardness is not a health concern. It's a measure of dissolved calcium and magnesium. Contact your water utility for exact values.
Water pH Level
Estimated based on USGS water monitoring data for your county.
Source: USGS National Water Information System. EPA secondary standard for pH is 6.5–8.5. Contact your water utility for exact values.
Lead & Copper
What To Do
Violations
No water systems found
We couldn't find a public water system for ZIP code .
- Double-check the ZIP code
- Some rural areas are served by private wells, which are not in the EPA database
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