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Community Water System · PWS IL0670500

Nauvoo

Nauvoo, Illinois 62354 - drinking water served from surface water sources to 1,200 people, tracked in EPA SDWIS and UCMR5.

1,200
People served
303
EPA violations
112
Health-based
Untested
UCMR5 result

The verdict

EPA records 303 drinking-water violations at Nauvoo, 37% of them health-based - above the Illinois per-system average.

303
Total EPA violations on record
37%
Health-based (MCL / treatment failure)
1,200
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Nauvoo

Nauvoo is a local-owned community water system that delivers drinking water to 1,200 residents in Nauvoo, Illinois (Hancock County) through 682 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 303 total violations for this system , of which 112 (37%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 167 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 72 violations (TT, 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%).

Nauvoo's 303 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
1,200
Total Violations
303
Health-Based Violations
112
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
682
County
Hancock
School/Daycare
No
MCL Violations
38
Monitoring Violations
167
Treatment Tech Violations
74

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule TT 72 2006
Total Haloacetic Acids (HAA5) MCL 30 2009
Coliform (TCR) MR 16 2008
Chloramine MR 15 2025
Toxaphene MR 6 2023
CARBON, TOTAL MR 6 2023
TTHM MCL 6 2008
Lead and Copper Rule MR 5 2006
Barium MR 5 2004
Cadmium MR 5 2004
Chromium MR 5 2004
Mercury MR 5 2004
Selenium MR 5 2004
Arsenic MR 5 2004
Fluoride MR 5 2004
Nickel MR 4 2004
Antimony, Total MR 4 2004
Thallium, Total MR 4 2004
Consumer Confidence Rule Other 4 2021
Public Notice Other 4 2024
CYANIDE MR 4 2004
Beryllium, Total MR 4 2004
BHC-GAMMA MR 2 2008
Dalapon MR 2 2008
Diquat MR 2 2008
Di(2-ethylhexyl) adipate MR 2 2008
Di(2-ethylhexyl) phthalate MR 2 2008
Picloram MR 2 2008
Aldicarb sulfone MR 2 2008
Carbofuran MR 2 2008

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 Nauvoo.

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 IL0670500 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 Nauvoo 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
2025 Chloramine MR 15 SDWIS / IL0670500 / 1006
2025 Revised Total Coliform Rule MON 2 SDWIS / IL0670500 / 8000
2024 Public Notice Other 4 SDWIS / IL0670500 / 7500
2023 Toxaphene MR 6 SDWIS / IL0670500 / 2020
2023 CARBON, TOTAL MR 6 SDWIS / IL0670500 / 2920
2021 Consumer Confidence Rule Other 4 SDWIS / IL0670500 / 7000
2009 Total Haloacetic Acids (HAA5) MCL 30 SDWIS / IL0670500 / 2456
2008 Coliform (TCR) MR 16 SDWIS / IL0670500 / 3100
2008 TTHM MCL 6 SDWIS / IL0670500 / 2950
2008 BHC-GAMMA MR 2 SDWIS / IL0670500 / 2010
2008 Dalapon MR 2 SDWIS / IL0670500 / 2031
2008 Diquat MR 2 SDWIS / IL0670500 / 2032
2008 Di(2-ethylhexyl) adipate MR 2 SDWIS / IL0670500 / 2035
2008 Di(2-ethylhexyl) phthalate MR 2 SDWIS / IL0670500 / 2039
2008 Picloram MR 2 SDWIS / IL0670500 / 2040

How Nauvoo Compares

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

Metric Nauvoo Illinois avg Federal benchmark
Total violations 303 69.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 112 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 1,200 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 Nauvoo water safe to drink? ▼
Nauvoo (PWS ID: IL0670500) has 303 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,200 people using Surface Water sources.
How many people does Nauvoo serve? ▼
Nauvoo serves 1,200 people in Nauvoo, Illinois. It is a Local-owned system using Surface Water water sources with 682 service connections.
What type of violations does Nauvoo have? ▼
Nauvoo has 303 total violations: 112 health-based violations (MCL exceedances or treatment failures), 167 monitoring/reporting violations, and 74 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Nauvoo water? ▼
No PFAS testing data is available for Nauvoo under the EPA's UCMR5 monitoring program.
What water source does Nauvoo use? ▼
Nauvoo 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.