Community Water System · PWS ID1050024
St Maries City Of
Operator location St Maries, Idaho - 29% of 28 violations are health-based (upper-third health share (> 23%)); surface water source; 4,173 served per SDWIS.
- 4,173
- People served (this PWS)
- 28
- EPA violations (this PWS)
- 8
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
St Maries City Of standing, mid SDWIS violation third
29% of 28 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 29% is upper-third health share (> 23%). Population rank #8,635 of 29,740 among systems serving 500+.
The verdict
St Maries City Of lands in the middle third by violation volume (28), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (4,173; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 29% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #8,635 of 29,740
- Population · /systems
- #49 of 249
- Population · ID
- 28
- Total EPA violations on record
- 29%
- 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
- 1,669
- County
- Benewah
- School/Daycare
- No
- MCL Violations
- 2
- Monitoring Violations
- 19
- Treatment Tech Violations
- 6
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | TT | 6 | 2005 |
| Nitrate | MR | 3 | 2002 |
| Coliform (TCR) | MR | 3 | 2006 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2005 |
| TTHM | MR | 2 | 2005 |
| Coliform (TCR) | MCL | 2 | 2001 |
| Dalapon | MR | 1 | 1996 |
| 2,4-D | MR | 1 | 1996 |
| 2,4,5-TP | MR | 1 | 1996 |
| Arsenic | MR | 1 | 2001 |
| Chlorine | MR | 1 | 2006 |
| Dinoseb | MR | 1 | 1996 |
| Picloram | MR | 1 | 1996 |
| Surface Water Treatment Rule | MR | 1 | 2004 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
Violation Count vs. the National Corpus
St Maries City Of has 28 recorded EPA violations, 40% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 59% carry more. 29% of this system's own violations are health-based (8 of 28), and it ranks #8,635 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)
28 Lower than most fewer violations than 59% 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 St Maries City Of
8 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for ID1050024.
Sources: EPA SDWIS
Nationwide peers
28 violations · 4,173 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with St Maries City Of
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Idaho compares on the same EPA violation measures. Idaho 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.