Community Water System · PWS IL0670500
Nauvoo
Operator location Nauvoo, Illinois - 37% of 303 violations are health-based (upper-third health share (> 23%)); surface water source; 1,200 served per SDWIS.
- 1,200
- People served (this PWS)
- 303
- EPA violations (this PWS)
- 112
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Nauvoo standing, high SDWIS violation third
37% of 303 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 37% is upper-third health share (> 23%). Population rank #17,829 of 29,740 among systems serving 500+.
The verdict
Nauvoo sits in the upper third of the sitemap cohort by violation count (303), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,200 (mid served population (≤ 3,309)). Health-based share is 37% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #17,829 of 29,740
- Population · /systems
- #791 of 1,310
- Population · IL
- 303
- Total EPA violations on record
- 37%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
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 |
Violation Count vs. the National Corpus
Nauvoo has 303 recorded EPA violations, 91% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 9% carry more. 37% of this system's own violations are health-based (112 of 303), and it ranks #17,829 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
303 Higher than most more violations than 91% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Health-based violations on Nauvoo
112 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for IL0670500.
Sources: EPA SDWIS · Illinois EPA, Bureau of Water
Nationwide peers
303 violations · 1,200 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Nauvoo
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Illinois compares on the same EPA violation measures. Illinois systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.