A92/100
Westminster Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 203,195 residents · Colorado
What's In Westminster's Tap Water?
76
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed to complete routine monitoring
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2025 – January 31, 2025Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed to complete routine monitoring
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: December 1, 2024 – December 31, 2024Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed to complete routine monitoring
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2022 – January 31, 2022Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
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
Water Utility Details
CASA ESTATES MHP
Population Served
1,117
Water Source
Purchased Surface Water
System ID
CO0101167
WESTMINSTER CITY OF
Population Served
202,078
Water Source
Surface Water
System ID
CO0101170
Frequently Asked Questions About Westminster Water
Is Westminster tap water safe to drink?
Westminster, Colorado tap water receives a grade of A (92/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA maximum contaminant levels (MCLs) and 1 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Westminster's water?
Of the 76 contaminants tested in Westminster's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Westminster have any water quality violations?
Yes, Westminster has 12 EPA violation(s) on record, with the most recent in 2025. Violation types include MR. None of these are classified as health-based violations.
Do I need a water filter in Westminster?
Westminster water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does Westminster's tap water come from?
Westminster's drinking water is sourced from purchased surface water and supplied by CASA ESTATES MHP and 1 other water system(s). The system serves approximately 203,195 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Westminster's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Westminster's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Westminster's water compare to other cities in Colorado?
Westminster's water quality score of 92/100 earns a grade of A, which is considered excellent. This places Westminster among the better-performing water systems in Colorado. Visit our Colorado state page to see how all cities in the state compare.
What should I do if I'm concerned about Westminster's water quality?
If you have concerns about Westminster's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (CASA ESTATES MHP) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.