Is Thompsonville, IL Tap Water Safe to Drink?
Graded A-, with 4 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
88.6/100
waterverge.com Thompsonville, IL — Water Quality Report
Thompsonville's drinking water received a grade of A- (88.6 out of 100), indicating good water quality. The city's 2 water systems serve approximately 2,854 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 10 violations on record, including 0 health-based violations. 4 remain unresolved.
What to know about Thompsonville's water
Thompsonville ranks #212 out of 891 cities in Illinois for water quality, placing it above average 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, Thompsonville may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Thompsonville, IL water safe to drink?
Thompsonville's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (88.6/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 2,854 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Thompsonville
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Thompsonville's water quality assessment. Grade: A- (88.6/100).
Contaminants: Total Haloacetic Acids (HAA5).
Contaminants: Total Haloacetic Acids (HAA5).
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-3230). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-373). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Thompsonville's water supply.
Well within EPA limits.
Violation history
Thompsonville's water system has 10 total violations on record, including 0 health-based violations. 4 remain unresolved. 2 violations were issued in the last 5 years.
Flood & environmental risk
Franklin County has experienced 2 federally declared disasters since 1973. 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 Thompsonville's water come from?
Thompsonville's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 2 water systems serving approximately 2,854 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment.
What Thompsonville residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Thompsonville'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 Thompsonville
Industrial polluters nearby
Reported releases to surface water by facilities near Thompsonville, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
SUGAR CAMP ENERGY MACEDONIA, IL62860 | — | — | 8.2 mi |
CROWNLINE BOATS WEST FRANKFORT, IL62896 | — | — | 9.6 mi |
WILLIAMSON ENERGY MARION, IL62959 | — | — | 6.4 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D1 — moderate droughtFranklin County is currently in D1 (moderate drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Franklin County has experienced 2 federally declared disasters since 1973. 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 Thompsonville compares by contaminant
Explore where Thompsonville ranks among all Illinois cities for specific contaminants.
Water source & infrastructure
Where Thompsonville's water comes from
Thompsonville'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 local government ownership and serves approximately 2,854 people through 2 water systems.
Water systems serving Thompsonville
| System Name | PWSID | Population | Source |
|---|---|---|---|
| AKIN WATER DISTRICT | IL0555120 | 2,368 | SWP |
| THOMPSONVILLE | IL0550500 | 486 | SWP |
How Thompsonville compares
Full Illinois rankings →Thompsonville's score of 88.6/100 is above the average of 56/100 among major Illinois cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Illinois rankings →About Thompsonville, IL
Learn more about your water
Guides and resources related to Thompsonville's water quality findings.
Explore water quality across Franklin
Frequently asked questions
Is Thompsonville, IL tap water safe to drink?
Thompsonville's water quality earned a grade of A- (88.6/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #212 out of 891 cities tested in Illinois.
What contaminants are in Thompsonville's water?
Lead was measured at 0.0 ppb (90th percentile). 10 violations are on record.
How is Thompsonville'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 Thompsonville?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Thompsonville's water come from?
Thompsonville's water is sourced from Purchased surface water. The city has 2 water systems serving approximately 2,854 residents.
How does Thompsonville's water compare to other cities?
Thompsonville ranks #212 out of 891 cities in Illinois (better than 76% of state cities) and #3351 out of 15744 cities nationally (79th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.