Non-Transient Non-Community Water System · PWS ID1280091
Silverwood
Operator location Athol, Idaho - larger served population (> 3,309) at 3,930 people served; 88 SDWIS violations on record from groundwater sources.
- 3,930
- People served (this PWS)
- 88
- EPA violations (this PWS)
- 2
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Silverwood standing, high SDWIS violation third
3,930 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 2% is middle-third health share (≤ 23%). Population rank #8,977 of 29,740 among systems serving 500+.
The verdict
Silverwood sits in the upper third of the sitemap cohort by violation count (88), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (3,930; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 2% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #8,977 of 29,740
- Population · /systems
- #51 of 249
- Population · ID
- 88
- Total EPA violations on record
- 2%
- 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
- Non-Transient Non-Community
- Owner Type
- Private
- Connections
- 55
- County
- Kootenai
- School/Daycare
- No
- MCL Violations
- 2
- Monitoring Violations
- 84
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Revised Total Coliform Rule | MON | 12 | 2024 |
| Lead and Copper Rule | MR | 8 | 2009 |
| Nitrate | MR | 4 | 2006 |
| Cadmium | MR | 3 | 2008 |
| Chromium | MR | 3 | 2008 |
| Barium | MR | 3 | 2008 |
| Arsenic | MR | 3 | 2008 |
| Selenium | MR | 3 | 2008 |
| Mercury | MR | 3 | 2008 |
| Nickel | MR | 2 | 2008 |
| Antimony, Total | MR | 2 | 2008 |
| Beryllium, Total | MR | 2 | 2008 |
| Thallium, Total | MR | 2 | 2008 |
| Public Notice | Other | 2 | 2011 |
| Coliform (TCR) | MCL | 2 | 2002 |
| Coliform (TCR) | MR | 2 | 2012 |
| Pentachlorophenol | MR | 1 | 1993 |
| Methoxychlor | MR | 1 | 1993 |
| Toxaphene | MR | 1 | 1993 |
| Total Polychlorinated Biphenyls (PCB) | MR | 1 | 1993 |
| Benzene | MR | 1 | 1993 |
| Carbon tetrachloride | MR | 1 | 1993 |
| cis-1,2-Dichloroethylene | MR | 1 | 1993 |
| 1,2-Dichloroethane | MR | 1 | 1993 |
| o-Dichlorobenzene | MR | 1 | 1993 |
| p-Dichlorobenzene | MR | 1 | 1993 |
| CHLOROBENZENE | MR | 1 | 1993 |
| Styrene | MR | 1 | 1993 |
| ETHYLENE DIBROMIDE | MR | 1 | 1993 |
| Tetrachloroethylene | MR | 1 | 1993 |
Violation Count vs. the National Corpus
Silverwood has 88 recorded EPA violations, 70% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 29% carry more. 2% of this system's own violations are health-based (2 of 88), and it ranks #8,977 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)
88 Around the middle fewer violations than 29% 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 Silverwood
EPA SDWIS lists 3,930 people served and 55 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
88 violations · 3,930 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 similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Silverwood
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.