Is Stonington, IL Tap Water Safe to Drink?
Graded A, with 1 unresolved violation on record. See what was cited — and what it means for your tap. What to do next ↓
94.5/100
waterverge.com Stonington, IL — Water Quality Report
Stonington's drinking water received a grade of A (94.5 out of 100), indicating excellent water quality. The city's 2 water systems serve approximately 1,800 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 5 violations on record, including 0 health-based violations. 1 remains unresolved.
What to know about Stonington's water
Stonington ranks #19 out of 891 cities in Illinois for water quality, placing it one of the best in the state.
Stonington 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, Stonington may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Stonington, IL water safe to drink?
Stonington's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (94.5/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 2 water systems serve approximately 1,800 residents using groundwater (wells).
Recent water quality updates for Stonington
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Stonington's water quality assessment. Grade: A (94.5/100).
Contaminants: Coliform (TCR).
Contaminants: Chlorine.
Contaminants: Coliform (TCR).
Federal disaster declaration (FEMA DR-3230). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Stonington's water supply.
Well within EPA limits.
Violation history
Stonington's water system has 5 total violations on record, including 0 health-based violations. 1 remain unresolved.
Flood & environmental risk
Christian County has experienced 1 federally declared disaster since 2005. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Stonington's water come from?
Stonington's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 1,800 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Stonington 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
Top industrial polluters within 10 miles of Stonington
Industrial polluters nearby
Reported releases to surface water by facilities near Stonington, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
AHLSTROM FILTRATION LLC TAYLORVILLE, IL62568 | — | — | 7.5 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Superfund sites within 10 miles of Stonington
Superfund sites nearby
Federally tracked hazardous-waste sites on the EPA National Priorities List. Proximity does not necessarily indicate tap-water contamination — the connection depends on hydrology and treatment.
- CENTRAL ILLINOIS PUBLIC SERVICE CO8.8 mi
Source: EPA Superfund National Priorities List
Flood & disaster history
Christian County has experienced 1 federally declared disaster since 2005. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
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 Stonington compares by contaminant
Explore where Stonington ranks among all Illinois cities for specific contaminants.
Water source & infrastructure
Where Stonington's water comes from
Stonington'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 1,800 people through 2 water systems.
Water systems serving Stonington
| System Name | PWSID | Population | Source |
|---|---|---|---|
| STONINGTON | IL0210550 | 932 | GW |
| SHARPSBURG AND NEIGHBORING AREA WATER SY | IL0210030 | 868 | GWP |
How Stonington compares
Full Illinois rankings →Stonington's score of 94.5/100 is above the average of 56/100 among major Illinois cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Illinois rankings →About Stonington, IL
Wikipedia →Stonington is a village in Christian County, Illinois, United States. The population was 837 at the 2020 census.
Learn more about your water
Guides and resources related to Stonington's water quality findings.
Explore water quality across Christian
Frequently asked questions
Is Stonington, IL tap water safe to drink?
Stonington's water quality earned a grade of A (94.5/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #19 out of 891 cities tested in Illinois.
What contaminants are in Stonington's water?
Lead was measured at 0.0 ppb (90th percentile). 5 violations are on record.
How is Stonington'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 Stonington?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Stonington's water come from?
Stonington's water is sourced from Groundwater. The city has 2 water systems serving approximately 1,800 residents.
Is Stonington's groundwater at risk of contamination?
Stonington 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 5 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 Stonington's water compare to other cities?
Stonington ranks #19 out of 891 cities in Illinois (better than 98% of state cities) and #483 out of 15744 cities nationally (97th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.