Community Water System · PWS WA5374400
Roslyn City Of
Operator location Roslyn, Washington - lower-third violation load (≤ 21 violations) with 19 EPA violations; surface water source; 2,099 served (PWS-level, not municipal population).
- 2,099
- People served (this PWS)
- 19
- EPA violations (this PWS)
- 4
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Roslyn City Of standing, low SDWIS violation third
19 EPA SDWIS violations on record - lower-third violation load (≤ 21 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 21% is middle-third health share (≤ 23%). Population rank #13,212 of 29,740 among systems serving 500+.
The verdict
Roslyn City Of is in the lower third by violation count (19; lower-third violation load (≤ 21 violations)). A low count does not mean the system is unmonitored - monitoring and reporting violations still appear in SDWIS. Population served is mid-pack at 2,099 (mid served population (≤ 3,309)). Health-based share is 21% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #13,212 of 29,740
- Population · /systems
- #349 of 766
- Population · WA
- 19
- Total EPA violations on record
- 21%
- 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
- 710
- County
- Kittitas
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 6
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Consumer Confidence Rule | Other | 4 | 2025 |
| Surface Water Treatment Rule | TT | 4 | 1992 |
| TTHM | MR | 2 | 2014 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2014 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
| Coliform (TCR) | MR | 1 | 1992 |
Violation Count vs. the National Corpus
Roslyn City Of has 19 recorded EPA violations, 30% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 69% carry more. 21% of this system's own violations are health-based (4 of 19), and it ranks #13,212 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)
19 Lower than most fewer violations than 69% 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
SDWIS compliance record for Roslyn City Of
19 violations on record for WA5374400; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · Washington State Department of Health, Office of Drinking Water
Nationwide peers
19 violations · 2,099 served: nearest cross-state SDWIS matches.
Cross-state systems with similarly light violation ledgers
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 Roslyn City Of
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Washington compares on the same EPA violation measures. Washington 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.