Is Westminster, MO Tap Water Safe to Drink?
Graded A, with 2 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
92.9/100
waterverge.com Westminster, MO — Water Quality Report
Westminster's drinking water received a grade of A (92.9 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 1,703 residents using purchased surface water.
Lead levels were measured at 0.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 14 violations on record, including 1 health-based violation. 2 remain unresolved.
What to know about Westminster's water
Westminster ranks #34 out of 509 cities in Missouri for water quality, placing it one of the best in the state.
The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection.
As a small community water system, Westminster may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Westminster, MO water safe to drink?
Westminster's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (92.9/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 1,703 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Westminster
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Westminster's water quality assessment. Grade: A (92.9/100).
1 health-based. Contaminants: Coliform (TCR).
Contaminants: Coliform (TCR).
Contaminants: Consumer Confidence Rule.
Key contaminant findings
Based on the most recent EPA sampling data for Westminster's water supply.
Well within EPA limits.
Violation history
Westminster's water system has 14 total violations on record, including 1 health-based violation. 2 remain unresolved.
Where does Westminster's water come from?
Westminster's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 1,703 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Creve Coeur Creek At Chesterfield (river), Creve Coeur Creek Near Creve Coeur (river), Fee Fee Creek Near Bridgeton (river), River Des Peres Near University City (river), River Des Peres Tributary At Pagedale (river).
What Westminster residents can do
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Westminster compares by contaminant
Explore where Westminster ranks among all Missouri cities for specific contaminants.
Water source & infrastructure
Where Westminster's water comes from
Westminster's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards.
These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge.
The system is operated by private ownership and serves approximately 1,703 people through 1 water system.
Water bodies near Westminster
Westminster is located near 5 notable water bodies. As a surface water system, these water bodies may directly influence the city's drinking water supply.
Water systems serving Westminster
| System Name | PWSID | Population | Source |
|---|---|---|---|
| FOXWOOD HILLS (SC3750025) | SC3750025 | 1,703 | SWP |
How Westminster compares
Full Missouri rankings →Westminster's score of 92.9/100 is above the average of 62/100 among major Missouri cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Missouri rankings →About Westminster, MO
Wikipedia →Des Peres is a city in west St. Louis County, Missouri, United States. The population was 9,193 at the 2020 census.
Learn more about your water
Guides and resources related to Westminster's water quality findings.
Explore water quality across Oconee
Frequently asked questions
Is Westminster, MO tap water safe to drink?
Westminster's water quality earned a grade of A (92.9/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #34 out of 509 cities tested in Missouri.
What contaminants are in Westminster's water?
Lead was measured at 0.0 ppb (90th percentile). 14 violations are on record.
How is Westminster's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Westminster?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Westminster's water come from?
Westminster's water is sourced from Purchased surface water. The city has 1 water system serving approximately 1,703 residents.
What health violations has Westminster's water system had?
Westminster has 1 health-based violation on record. The most recent violation was recorded in July 2012. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
How does Westminster's water compare to other cities?
Westminster ranks #34 out of 509 cities in Missouri (better than 93% of state cities) and #1059 out of 15744 cities nationally (93th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Westminster's small water system affect quality?
Westminster's system serves approximately 1,703 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 14 violations on record.