Is Foristell, MO Tap Water Safe to Drink?
Graded B, with 14 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
75/100
waterverge.com Foristell, MO — Water Quality Report
Foristell's drinking water received a grade of B (75 out of 100), indicating good water quality. The city's 4 water systems serve approximately 1,225 residents using groundwater.
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 87 violations on record, including 49 health-based violations. 14 remain unresolved.
What to know about Foristell's water
Foristell ranks #364 out of 509 cities in Missouri for water quality, placing it below average in the state.
Foristell relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Foristell may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 7 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Foristell, MO water safe to drink?
Foristell's drinking water has significant quality concerns based on EPA testing data. With a grade of B (75/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 4 water systems serve approximately 1,225 residents using groundwater (wells).
Recent water quality updates for Foristell
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Foristell's water quality assessment. Grade: B (75/100).
Contaminants: Lead and Copper Rule.
Contaminants: Groundwater Rule.
Contaminants: Consumer Confidence Rule.
Key contaminant findings
Based on the most recent EPA sampling data for Foristell's water supply.
Well within EPA limits.
Violation history
Foristell's water system has 87 total violations on record, including 49 health-based violations. 14 remain unresolved. 7 violations were issued in the last 5 years.
Where does Foristell's water come from?
Foristell's drinking water comes from groundwater (wells), supplied by 4 water systems serving approximately 1,225 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Cuivre River At Old Monroe (river), Dardenne Creek At O'Fallon (river), Dardenne Creek At Old Town St. Peters (river), Bonhomme Creek Near Clarkson Valley (river), Caulks Creek At Chesterfield (river).
What Foristell residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Foristell's water.
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
Top industrial polluters within 10 miles of Foristell
Industrial polluters nearby
Reported releases to surface water by facilities near Foristell, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
GENERAL MOTORS WENTZVILLE ASSEMBLY WENTZVILLE, MO63385 | — | — | 7.5 mi |
SUPERIOR HOME PRODUCTS INC WENTZVILLE, MO63385 | — | — | 6.9 mi |
WARREN COUNTY CONCRETE - WENTZVILLE WENTZVILLE, MO63385 | — | — | 7.7 mi |
UNIVERSAL GALVANIZING INC WRIGHT CITY, MO63390 | — | — | 3.4 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
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 Foristell compares by contaminant
Explore where Foristell ranks among all Missouri cities for specific contaminants.
Water source & infrastructure
Where Foristell's water comes from
Foristell's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by local government ownership and serves approximately 1,225 people through 4 water systems.
Water bodies near Foristell
Foristell is located near 5 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Foristell
| System Name | PWSID | Population | Source |
|---|---|---|---|
| ST CHARLES PWSD 2 FORISTELL | MO6010287 | 550 | GW |
| MO AMERICAN JAXSON | MO6031461 | 535 | GW |
| BIG COUNTRY ACRES SUBDIVISION | MO6030662 | 90 | GW |
| COUNTRY ESTATES | MO6030484 | 50 | GW |
How Foristell compares
Full Missouri rankings →Foristell's score of 75/100 is above the average of 62/100 among major Missouri cities. It outscores 6 of 10 nearby cities.
Nearby cities
View Missouri rankings →About Foristell, MO
Learn more about your water
Guides and resources related to Foristell's water quality findings.
Explore water quality across St. Charles
Frequently asked questions
Is Foristell, MO tap water safe to drink?
Foristell's water quality earned a grade of B (75/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #364 out of 509 cities tested in Missouri.
What contaminants are in Foristell's water?
Lead was measured at 0.0 ppb (90th percentile). 87 violations are on record.
How is Foristell'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 Foristell?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Foristell's water come from?
Foristell's water is sourced from Groundwater. The city has 4 water systems serving approximately 1,225 residents.
What health violations has Foristell's water system had?
Foristell has 49 health-based violations on record. The most recent violation was recorded in December 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 14 violations remain unresolved.
Is Foristell's groundwater at risk of contamination?
Foristell uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 87 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Foristell's water compare to other cities?
Foristell ranks #364 out of 509 cities in Missouri (better than 28% of state cities) and #9703 out of 15744 cities nationally (38th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.