Community Water System · PWS IA6015047
Doon Water Supply
Operator location Doon, Iowa - 46% of 304 violations are health-based (upper-third health share (> 23%)); groundwater source; 619 served per SDWIS.
- 619
- People served (this PWS)
- 304
- EPA violations (this PWS)
- 139
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Doon Water Supply standing, high SDWIS violation third
46% of 304 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 46% is upper-third health share (> 23%). Population rank #25,805 of 29,740 among systems serving 500+.
The verdict
Doon Water Supply sits in the upper third of the sitemap cohort by violation count (304), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (619; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 46% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #25,805 of 29,740
- Population · /systems
- #490 of 545
- Population · IA
- 304
- Total EPA violations on record
- 46%
- 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
- 240
- County
- Lyon
- School/Daycare
- No
- MCL Violations
- 139
- Monitoring Violations
- 126
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MCL | 120 | 2006 |
| Coliform (TCR) | MR | 55 | 2014 |
| Coliform (TCR) | MCL | 19 | 1994 |
| Revised Total Coliform Rule | MON | 16 | 2022 |
| Chlorine | MR | 14 | 2011 |
| Nitrate | Other | 10 | 1987 |
| Nitrate | MR | 10 | 1991 |
| Arsenic | MR | 7 | 2002 |
| Barium | MR | 4 | 1991 |
| Chromium | MR | 4 | 1991 |
| Fluoride | MR | 4 | 1991 |
| Mercury | MR | 4 | 1991 |
| Cadmium | MR | 4 | 1991 |
| Selenium | MR | 4 | 1991 |
Violation Count vs. the National Corpus
Doon Water Supply has 304 recorded EPA violations, 91% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 9% carry more. 46% of this system's own violations are health-based (139 of 304), and it ranks #25,805 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)
304 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 Doon Water Supply
139 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for IA6015047.
Sources: EPA SDWIS
Nationwide peers
304 violations · 619 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 with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Doon Water Supply
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Iowa compares on the same EPA violation measures. Iowa 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.