Community Water System · PWS ND2800650
Mercer City Of
Operator location Mercer, North Dakota - smaller served population (≤ 999) at 94 people served; 154 SDWIS violations on record from groundwater sources.
- 94
- People served (this PWS)
- 154
- EPA violations (this PWS)
- 7
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Mercer City Of standing, high SDWIS violation third
94 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 5% is middle-third health share (≤ 23%).
The verdict
Mercer City Of sits in the upper third of the sitemap cohort by violation count (154), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (94; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 5% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 154
- Total EPA violations on record
- 5%
- Health-based (MCL / treatment failure)
- 94
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
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
- 56
- County
- McLean
- School/Daycare
- No
- MCL Violations
- 7
- Monitoring Violations
- 101
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 40 | 2011 |
| Chlorine | MR | 40 | 2025 |
| Revised Total Coliform Rule | MON | 20 | 2025 |
| Coliform (TCR) | MCL | 6 | 1998 |
| Public Notice | Other | 6 | 2009 |
| Coliform (TCR) | Other | 5 | 1998 |
| LEAD AND COPPER RULE REVISIONS | RPT | 4 | 2025 |
| Lead and Copper Rule | MR | 1 | 2010 |
| Fluoride | MCL | 1 | 1981 |
Violation Count vs. the National Corpus
Mercer City Of has 154 recorded EPA violations, 81% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 18% carry more. 5% of this system's own violations are health-based (7 of 154), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
154 Higher than most more violations than 81% 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
Population served record for Mercer City Of
EPA SDWIS lists 94 people served and 56 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
154 violations · 94 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.
What to do with Mercer City Of
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in North Dakota compares on the same EPA violation measures. North Dakota 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.