Transient Non-Community Water System · PWS OR4191072
Oprd Hat Rock State Park
Operator location Meacham, Oregon - 32% of 65 violations are health-based (upper-third health share (> 23%)); groundwater source; 500 served per SDWIS.
- 500
- People served (this PWS) Smaller third of systems
- 65
- EPA violations (this PWS) Middle third of systems
- 21
- Health-based (this PWS) Upper third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Oprd Hat Rock State Park standing, mid SDWIS violation third
32% of 65 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 32% is upper-third health share (> 23%). Population rank #29,454 of 29,740 among systems serving 500+.
The verdict
Oprd Hat Rock State Park lands in the middle third by violation volume (65), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (500; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 32% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #29,454 of 29,740
- Population · /systems
- #356 of 373
- Population · OR
- 65
- Total EPA violations on record
- 32%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Transient Non-Community
- Owner Type
- State
- Connections
- 3
- County
- Umatilla
- School/Daycare
- No
- MCL Violations
- 21
- Monitoring Violations
- 39
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 22 | 2015 |
| Nitrate | MCL | 16 | 2021 |
| Nitrate | MR | 9 | 2023 |
| Coliform (TCR) | MCL | 5 | 2015 |
| Revised Total Coliform Rule | MON | 5 | 2020 |
| E. COLI | MR | 3 | 2023 |
| Public Notice | Other | 2 | 2021 |
Violation Count vs. the National Corpus
Oprd Hat Rock State Park has 65 recorded EPA violations, 63% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 36% carry more. 32% of this system's own violations are health-based (21 of 65), and it ranks #29,454 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)
65 Around the middle fewer violations than 36% 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
How many violations vs. how serious, among peer systems
Oprd Hat Rock State Park plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
Health-based violations on Oprd Hat Rock State Park
21 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for OR4191072.
Sources: EPA SDWIS
Nationwide peers
65 violations · 500 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 smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Oprd Hat Rock State Park
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Oregon compares on the same EPA violation measures. Oregon 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.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.