Public water system record
Illiopolis
Serves Illiopolis, Sangamon County, IL · 1,037 people served
Federal records show 4 health-based violations and 7 monitoring/reporting issues for Illiopolis in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.
System profile
- Health-based violations, last 10 years
- 4
- Resolved
- 4
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 7
Key facts
- Illiopolis buys its water from United Regional Water Coop.
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit), 2021.
- Most recent formal enforcement: compliance order (no penalty) by Illinois, February 2022.
- Record on file since 1977, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 1 lead and 437 unknown out of 456 service lines.
Check whether Illiopolis serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Apr 1, 2022 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.091 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jan 1, 2022 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Oct 1, 2021 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.084 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jul 1, 2021 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jul 1, 2024 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2023 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2023 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jan 1, 2020 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
Full record since 1977
EPA's records for Illiopolis go back to 1977. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 3 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1970s | 0 | 1 |
| 2000s | 1 | 2 |
| October 19, 2016 to 2019 | 0 | 1 |
| 2020s | 4 | 6 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began July 2006, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 90 µg/L, federal limit 80 µg/L (1.1 times the limit)
|
Jul 1, 2006 | Resolved |
Enforcement actions
Illinois regulators took 2 formal enforcement actions against Illiopolis between 2006 and 2022, filed as 6 records in EPA's data. The most recent was a compliance order (no penalty) in February 2022.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Feb 22, 2022 | Illinois | Compliance order (no penalty) | 8 violations (8 health-based): Total Trihalomethanes (TTHMs) |
| Nov 16, 2006 | Illinois | Signed compliance agreement | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
What the violations mean
Total Trihalomethanes (TTHMs)
4 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Where the water comes from
Illiopolis buys its water from United Regional Water Coop. It lists no wells or intakes of its own.
Buys water from
- United Regional Water Coop Dieterich, IL
Annual water quality report
Illiopolis must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Illinois.
Certified drinking water labs by state EPA guidance for private wells