Community Water System · PWS WA5306461
Larch Corrections Center
Operator location Yacolt, Washington - 0% of 366 violations are health-based (lower-third health share (≤ 1%)); groundwater source; 705 served per SDWIS.
- 705
- People served (this PWS)
- 366
- EPA violations (this PWS)
- 0
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Larch Corrections Center standing, high SDWIS violation third
0% of 366 recorded violations are health-based - lower-third health share (≤ 1%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 0% is lower-third health share (≤ 1%). Population rank #24,194 of 29,740 among systems serving 500+.
The verdict
Larch Corrections Center sits in the upper third of the sitemap cohort by violation count (366), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (705; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is only 0% - almost all of this trail is monitoring or reporting. No UCMR5 PFAS test appears for this system in this extract.
- #24,194 of 29,740
- Population · /systems
- #621 of 766
- Population · WA
- 366
- Total EPA violations on record
- 0%
- 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
- State
- Connections
- 496
- County
- Clark
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 366
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| cis-1,2-Dichloroethylene | MR | 18 | 2005 |
| DICHLOROMETHANE | MR | 18 | 2005 |
| o-Dichlorobenzene | MR | 18 | 2005 |
| Vinyl chloride | MR | 18 | 2005 |
| 1,2-Dichloroethane | MR | 18 | 2005 |
| 1,1,2-Trichloroethane | MR | 18 | 2005 |
| CHLOROBENZENE | MR | 18 | 2005 |
| Ethylbenzene | MR | 18 | 2005 |
| p-Dichlorobenzene | MR | 18 | 2005 |
| Trichloroethylene | MR | 18 | 2005 |
| Tetrachloroethylene | MR | 18 | 2005 |
| Toluene | MR | 18 | 2005 |
| Styrene | MR | 18 | 2005 |
| 1,2,4-Trichlorobenzene | MR | 18 | 2005 |
| 1,1-Dichloroethylene | MR | 18 | 2005 |
| 1,1,1-Trichloroethane | MR | 18 | 2005 |
| Carbon tetrachloride | MR | 18 | 2005 |
| 1,2-Dichloropropane | MR | 18 | 2005 |
| Benzene | MR | 18 | 2005 |
| trans-1,2-Dichloroethylene | MR | 18 | 2005 |
| Diquat | MR | 5 | 2005 |
| Coliform (TCR) | MR | 1 | 1998 |
Violation Count vs. the National Corpus
Larch Corrections Center has 366 recorded EPA violations, 93% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 7% carry more. 0% of this system's own violations are health-based (0 of 366), and it ranks #24,194 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)
366 Higher than most more violations than 93% 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 Larch Corrections Center
0 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for WA5306461.
Sources: EPA SDWIS · Washington State Department of Health, Office of Drinking Water
Nationwide peers
366 violations · 705 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 Larch Corrections Center
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.