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Community Water System · PWS NC0467035

Onslow Wtr and Sewer Authority

Jacksonville, North Carolina 28540 - drinking water served from groundwater sources to 156,755 people, tracked in EPA SDWIS and UCMR5.

156,755
People served
247
EPA violations
21
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 247 drinking-water violations at Onslow Wtr and Sewer Authority, 9% of them health-based - above the North Carolina per-system average.

247
Total EPA violations on record
9%
Health-based (MCL / treatment failure)
156,755
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Onslow Wtr and Sewer Authority

Onslow Wtr and Sewer Authority is a local-owned community water system that delivers drinking water to 156,755 residents in Jacksonville, North Carolina (Onslow County) through 56,024 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 247 total violations for this system , of which 21 (9%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 192 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is TTHM, recorded in 15 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across North Carolina, EPA tracks 5,020 public water systems serving 9,877,724 people, with 524,053 cumulative violations and 38,492 health-based violations on record. About 93% of systems in the state carry at least one violation, and state-wide the average per system is 104.4 violations. Statewide, 174 of 287 UCMR5-tested systems have reported PFAS detections (60.6%).

Onslow Wtr and Sewer Authority's 247 violations sit above the North Carolina average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
156,755
Total Violations
247
Health-Based Violations
21
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
56,024
County
Onslow
School/Daycare
No
MCL Violations
19
Monitoring Violations
192
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 15 2013
Revised Total Coliform Rule RPT 15 2023
Dalapon MR 10 2005
Lead and Copper Rule MR 10 2007
E. COLI MR 8 2010
Coliform (TCR) MR 8 2010
Endrin MR 6 2005
BHC-GAMMA MR 6 2005
Methoxychlor MR 6 2005
Di(2-ethylhexyl) adipate MR 6 2005
OXAMYL MR 6 2005
Di(2-ethylhexyl) phthalate MR 6 2005
Dinoseb MR 6 2005
Carbofuran MR 6 2005
LASSO MR 6 2005
Heptachlor MR 6 2005
2,4-D MR 6 2005
2,4,5-TP MR 6 2005
Benzo(a)pyrene MR 6 2005
Total Polychlorinated Biphenyls (PCB) MR 6 2005
1,2-DIBROMO-3-CHLOROPROPANE MR 6 2005
ETHYLENE DIBROMIDE MR 6 2005
Chlordane MR 6 2005
Heptachlor epoxide MR 6 2005
Pentachlorophenol MR 6 2005
HEXACHLOROBENZENE MR 6 2005
Toxaphene MR 6 2005
Hexachlorocyclopentadiene MR 6 2005
Atrazine MR 6 2005
Picloram MR 6 2005

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 240 samples detected PFAS.

Contaminant Date Result MRL Status
PFTA 8/1/2023 <8.00 ppt 8.00 ppt Not Detected
NMeFOSAA 8/1/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 8/1/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 8/1/2023 <7.00 ppt 7.00 ppt Not Detected
PFPeA 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 8/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 8/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 8/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 8/1/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 8/1/2023 <5.00 ppt 5.00 ppt Not Detected
PFEESA 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 8/1/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 8/1/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 8/1/2023 <7.00 ppt 7.00 ppt Not Detected
PFHxS 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
4:2 FTS 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 8/1/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 8/1/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 8/1/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 8/1/2023 <5.00 ppt 5.00 ppt Not Detected
NFDHA 8/1/2023 <20.00 ppt 20.00 ppt Not Detected
9Cl-PF3ONS 8/1/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 8/1/2023 <5.00 ppt 5.00 ppt Not Detected
PFTA 8/1/2023 <8.00 ppt 8.00 ppt Not Detected
PFMBA 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 8/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFTA 8/1/2023 <8.00 ppt 8.00 ppt Not Detected
NEtFOSAA 8/1/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 8/1/2023 <6.00 ppt 6.00 ppt Not Detected
PFTrDA 8/1/2023 <7.00 ppt 7.00 ppt Not Detected
PFDA 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 8/1/2023 <2.00 ppt 2.00 ppt Not Detected
PFTA 8/1/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 8/1/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 8/1/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 8/1/2023 <6.00 ppt 6.00 ppt Not Detected
PFHpS 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 8/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 8/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 8/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 8/1/2023 <4.00 ppt 4.00 ppt Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Onslow Wtr and Sewer Authority.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID NC0467035 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

North Carolina Drinking Water Authority

North Carolina DEQ, Public Water Supply Section is the primacy agency that licenses and inspects Onslow Wtr and Sewer Authority under EPA-delegated authority.

Open NC regulator portal

Source: North Carolina DEQ, Public Water Supply Section

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 Public Notice Other 4 SDWIS / NC0467035 / 7500
2024 LEAD AND COPPER RULE REVISIONS TT 2 SDWIS / NC0467035 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 2 SDWIS / NC0467035 / 5200
2023 Revised Total Coliform Rule RPT 15 SDWIS / NC0467035 / 8000
2013 TTHM MCL 15 SDWIS / NC0467035 / 2950
2010 E. COLI MR 8 SDWIS / NC0467035 / 3014
2010 Coliform (TCR) MR 8 SDWIS / NC0467035 / 3100
2010 Chlorine MR 3 SDWIS / NC0467035 / 0999
2009 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 1 SDWIS / NC0467035 / 0600
2007 Lead and Copper Rule MR 10 SDWIS / NC0467035 / 5000
2006 Coliform (TCR) MCL 4 SDWIS / NC0467035 / 3100
2005 Dalapon MR 10 SDWIS / NC0467035 / 2031
2005 Endrin MR 6 SDWIS / NC0467035 / 2005
2005 BHC-GAMMA MR 6 SDWIS / NC0467035 / 2010
2005 Methoxychlor MR 6 SDWIS / NC0467035 / 2015

How Onslow Wtr and Sewer Authority Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Onslow Wtr and Sewer Authority North Carolina avg Federal benchmark
Total violations 247 104.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 21 7.7 Indicates a contaminant exceeded a federal MCL
PFAS detection None 60.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 156,755 1,968 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 5,020 regulated public water systems in North Carolina.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Onslow Wtr and Sewer Authority water safe to drink? ▼
Onslow Wtr and Sewer Authority (PWS ID: NC0467035) has 247 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 156,755 people using Groundwater sources.
How many people does Onslow Wtr and Sewer Authority serve? ▼
Onslow Wtr and Sewer Authority serves 156,755 people in Jacksonville, North Carolina. It is a Local-owned system using Groundwater water sources with 56,024 service connections.
What type of violations does Onslow Wtr and Sewer Authority have? ▼
Onslow Wtr and Sewer Authority has 247 total violations: 21 health-based violations (MCL exceedances or treatment failures), 192 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Onslow Wtr and Sewer Authority water? ▼
No. Onslow Wtr and Sewer Authority was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Onslow Wtr and Sewer Authority use? ▼
Onslow Wtr and Sewer Authority uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.