Non-Transient Non-Community Water System · PWS OR4195534
Monrovia South
Operator location Dayton, Oregon - 0% of 16 violations are health-based (lower-third health share (≤ 1%)); groundwater source; 175 served per SDWIS.
- 175
- People served (this PWS)
- 16
- EPA violations (this PWS)
- 0
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Monrovia South standing, low SDWIS violation third
0% of 16 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%).
The verdict
Monrovia South is in the lower third by violation count (16; 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 smaller (175; 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.
- 16
- Total EPA violations on record
- 0%
- Health-based (MCL / treatment failure)
- 175
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
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
- 7
- County
- Yamhill
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 16
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Revised Total Coliform Rule | MON | 9 | 2023 |
| Lead and Copper Rule | MR | 4 | 2023 |
| COLIPHAGE | MR | 1 | 2022 |
| E. COLI | MR | 1 | 2021 |
| Coliform (TCR) | MR | 1 | 2015 |
Violation Count vs. the National Corpus
Monrovia South has 16 recorded EPA violations, 26% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 72% carry more. 0% of this system's own violations are health-based (0 of 16), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
16 Lower than most fewer violations than 72% 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 Monrovia South
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 OR4195534.
Sources: EPA SDWIS
Nationwide peers
16 violations · 175 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.
What to do with Monrovia South
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.