Community Water System · PWS OR4100985
Hillsboro-Cherry Grove
Operator location Hillsboro, Oregon - 12% of 57 violations are health-based (middle-third health share (≤ 23%)); surface water source; 1,628 served per SDWIS.
- 1,628
- People served (this PWS) Middle third of systems
- 57
- EPA violations (this PWS) Middle third of systems
- 7
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Hillsboro-Cherry Grove standing, mid SDWIS violation third
12% of 57 recorded violations are health-based - middle-third health share (≤ 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 12% is middle-third health share (≤ 23%). Population rank #15,210 of 29,740 among systems serving 500+.
The verdict
Hillsboro-Cherry Grove lands in the middle third by violation volume (57), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 1,628 (mid served population (≤ 3,309)). Health-based share is 12% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #15,210 of 29,740
- Population · /systems
- #195 of 373
- Population · OR
- 57
- Total EPA violations on record
- 12%
- 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
- Community
- Owner Type
- Local
- Connections
- 577
- County
- Washington
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 46
- Treatment Tech Violations
- 6
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | MR | 9 | 2023 |
| Interim Enhanced Surface Water Treatment Rule | MR | 5 | 2023 |
| Lead and Copper Rule | TT | 4 | 2002 |
| Coliform (TCR) | MR | 2 | 1991 |
| TTHM | MR | 2 | 2009 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2009 |
| Surface Water Treatment Rule | TT | 2 | 1992 |
| Arsenic | MR | 1 | 2007 |
| Xylenes, Total | MR | 1 | 2007 |
| DICHLOROMETHANE | MR | 1 | 2007 |
| p-Dichlorobenzene | MR | 1 | 2007 |
| Vinyl chloride | MR | 1 | 2007 |
| 1,1-Dichloroethylene | MR | 1 | 2007 |
| 1,2-Dichloroethane | MR | 1 | 2007 |
| Carbon tetrachloride | MR | 1 | 2007 |
| 1,2-Dichloropropane | MR | 1 | 2007 |
| Trichloroethylene | MR | 1 | 2007 |
| 1,1,2-Trichloroethane | MR | 1 | 2007 |
| Tetrachloroethylene | MR | 1 | 2007 |
| CHLOROBENZENE | MR | 1 | 2007 |
| Toluene | MR | 1 | 2007 |
| Styrene | MR | 1 | 2007 |
| Coliform (TCR) | MCL | 1 | 1991 |
| Ethylbenzene | MR | 1 | 2007 |
| Benzene | MR | 1 | 2007 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2007 |
| Long Term 2 Enhanced Surface Water Treatment Rule | MR | 1 | 2008 |
| 1,1,1-Trichloroethane | MR | 1 | 2007 |
| Consumer Confidence Rule | Other | 1 | 2025 |
| Combined Radium (-226 and -228) | MR | 1 | 1976 |
Violation Count vs. the National Corpus
Hillsboro-Cherry Grove has 57 recorded EPA violations, 60% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 40% carry more. 12% of this system's own violations are health-based (7 of 57), and it ranks #15,210 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)
57 Around the middle fewer violations than 40% 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
Hillsboro-Cherry Grove 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 Hillsboro-Cherry Grove
7 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for OR4100985.
Sources: EPA SDWIS
Nationwide peers
57 violations · 1,628 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Hillsboro-Cherry Grove
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.