A90/100
COLTON, CITY OF — Water Quality Report 2026
Serving 46,525 people · California
Water Source
Groundwater
County
—
System ID
CA3610014
Violations
1
Contaminant Test Results
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 270.00 µg/L | — | Above Goal |
vanadium | 25.00 µg/L | — | Above Goal |
1,4-dioxane | 0.370 µg/L | — | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Exceeded the MCL for disinfection byproducts
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2022 – December 31, 2022Enforcement: Formal — state order issued
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About COLTON, CITY OF
Is COLTON, CITY OF water safe to drink?
COLTON, CITY OF water receives a grade of A (90/100), which is considered excellent. Out of 73 contaminants tested, none exceed EPA legal limits. 3 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has COLTON, CITY OF detected?
73 contaminants were tested in COLTON, CITY OF's water. Notable contaminants include chlorate, vanadium, 1,4-dioxane. No contaminants exceed EPA legal limits. 3 exceed EPA health goals (MCLGs).
Does COLTON, CITY OF have any EPA violations?
Yes, COLTON, CITY OF has 1 EPA violation(s) on record, with the most recent in 2022. Violation types include MR.
How many people does COLTON, CITY OF serve?
COLTON, CITY OF serves approximately 46,525 people, California. The system provides water to 1 community: Colton.
What type of water does COLTON, CITY OF provide?
COLTON, CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA3610014.
How does COLTON, CITY OF compare to other utilities in California?
COLTON, CITY OF scores 90/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our California state page for a full comparison of water systems.