Community Water System · PWS NC0467030
Northwest Onslow Water Assoc
Operator location Richlands, North Carolina - 21% of 62 violations are health-based (middle-third health share (≤ 23%)); groundwater source; 2,555 served per SDWIS.
- 2,555
- People served (this PWS)
- 62
- EPA violations (this PWS)
- 13
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Northwest Onslow Water Assoc standing, mid SDWIS violation third
21% of 62 recorded violations are health-based - middle-third health share (≤ 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 21% is middle-third health share (≤ 23%). Population rank #11,714 of 29,740 among systems serving 500+.
The verdict
Northwest Onslow Water Assoc lands in the middle third by violation volume (62), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 2,555 (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.
- #11,714 of 29,740
- Population · /systems
- #325 of 713
- Population · NC
- 62
- 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
- Private
- Connections
- 1,006
- County
- Onslow
- School/Daycare
- No
- MCL Violations
- 13
- Monitoring Violations
- 21
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 13 | 2012 |
| Revised Total Coliform Rule | RPT | 10 | 2022 |
| Consumer Confidence Rule | Other | 8 | 2018 |
| Nitrite | MR | 6 | 2000 |
| Asbestos | MR | 5 | 2020 |
| Coliform (TCR) | MR | 3 | 2004 |
| Chlorine | MR | 3 | 2004 |
| Public Notice | Other | 2 | 2005 |
| Combined Radium (-226 and -228) | MR | 1 | 1980 |
| Gross Beta Particle Activity | MR | 1 | 1980 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 1 | 2008 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1980 |
Violation Count vs. the National Corpus
Northwest Onslow Water Assoc has 62 recorded EPA violations, 62% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 37% carry more. 21% of this system's own violations are health-based (13 of 62), and it ranks #11,714 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)
62 Around the middle fewer violations than 37% 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 Northwest Onslow Water Assoc
13 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NC0467030.
Sources: EPA SDWIS · North Carolina DEQ, Public Water Supply Section
Nationwide peers
62 violations · 2,555 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 Northwest Onslow Water Assoc
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in North Carolina compares on the same EPA violation measures. North Carolina 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.