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Community Water System · PWS IL1170040

Central Macoupin County RWD

Carlinville, Illinois 62626 - drinking water served from surface water sources to 1,883 people, tracked in EPA SDWIS and UCMR5.

1,883
People served
160
EPA violations
141
Health-based
Untested
UCMR5 result

The verdict

EPA records 160 drinking-water violations at Central Macoupin County RWD, 88% of them health-based - above the Illinois per-system average.

160
Total EPA violations on record
88%
Health-based (MCL / treatment failure)
1,883
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Central Macoupin County RWD

Central Macoupin County RWD is a local-owned community water system that delivers drinking water to 1,883 residents in Carlinville, Illinois (Macoupin County) through 753 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 160 total violations for this system , of which 141 (88%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 16 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is TTHM, recorded in 59 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Illinois, EPA tracks 5,117 public water systems serving 12,576,876 people, with 355,322 cumulative violations and 52,932 health-based violations on record. About 81% of systems in the state carry at least one violation, and state-wide the average per system is 69.4 violations. Statewide, 199 of 487 UCMR5-tested systems have reported PFAS detections (40.9%).

Central Macoupin County RWD's 160 violations sit above the Illinois average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
1,883
Total Violations
160
Health-Based Violations
141
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
753
County
Macoupin
School/Daycare
No
MCL Violations
117
Monitoring Violations
16
Treatment Tech Violations
20

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 59 2010
Total Haloacetic Acids (HAA5) MCL 46 2006
Interim Enhanced Surface Water Treatment Rule TT 20 2015
Coliform (TCR) MR 12 2012
Coliform (TCR) MCL 8 2015
Chlorine dioxide MRDL 4 2011
Chlorine MR 4 2020
Chlorite MCL 4 2014
Public Notice Other 2 2004

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Central Macoupin County RWD.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID IL1170040 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Illinois Drinking Water Authority

Illinois EPA, Bureau of Water is the primacy agency that licenses and inspects Central Macoupin County RWD under EPA-delegated authority.

Open IL regulator portal

Source: Illinois EPA, Bureau of Water

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2020 Chlorine MR 4 SDWIS / IL1170040 / 0999
2015 Interim Enhanced Surface Water Treatment Rule TT 20 SDWIS / IL1170040 / 0300
2015 Coliform (TCR) MCL 8 SDWIS / IL1170040 / 3100
2014 Chlorite MCL 4 SDWIS / IL1170040 / 1009
2012 Coliform (TCR) MR 12 SDWIS / IL1170040 / 3100
2011 Chlorine dioxide MRDL 4 SDWIS / IL1170040 / 1008
2010 TTHM MCL 59 SDWIS / IL1170040 / 2950
2006 Total Haloacetic Acids (HAA5) MCL 46 SDWIS / IL1170040 / 2456
2004 Public Notice Other 2 SDWIS / IL1170040 / 7500

How Central Macoupin County RWD Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Central Macoupin County RWD Illinois avg Federal benchmark
Total violations 160 69.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 141 10.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 40.9% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,883 2,458 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 5,117 regulated public water systems in Illinois.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Central Macoupin County RWD water safe to drink? ▼
Central Macoupin County RWD (PWS ID: IL1170040) has 160 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,883 people using Surface Water sources.
How many people does Central Macoupin County RWD serve? ▼
Central Macoupin County RWD serves 1,883 people in Carlinville, Illinois. It is a Local-owned system using Surface Water water sources with 753 service connections.
What type of violations does Central Macoupin County RWD have? ▼
Central Macoupin County RWD has 160 total violations: 141 health-based violations (MCL exceedances or treatment failures), 16 monitoring/reporting violations, and 20 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Central Macoupin County RWD water? ▼
No PFAS testing data is available for Central Macoupin County RWD under the EPA's UCMR5 monitoring program.
What water source does Central Macoupin County RWD use? ▼
Central Macoupin County RWD uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.