Water Quality Report · Updated May 12, 2026
ONSLOW WTR AND SEWER AUTHORITY
ONSLOW WTR AND SEWER AUTHORITY delivers tap water graded C (66/100) by TapWaterSafety.org. The utility serves approximately 156,755 residents in JACKSONVILLE, North Carolina using groundwater. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline. For questions, the utility can be reached at 910-937-7520.
Is JACKSONVILLE tap water safe to drink?
ONSLOW WTR AND SEWER AUTHORITY delivers tap water that earns a grade of C (66/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 156,755 residents in JACKSONVILLE, drawing from groundwater.
Public testing data identifies 9 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Haloacetic acids (HAA5), Bromodichloromethane, Trichloroacetic acid, Chloroform, Dichloroacetic acid, Dibromochloromethane, Dibromoacetic acid. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for JACKSONVILLE residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for ONSLOW WTR AND SEWER AUTHORITY.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 29.6 ppb, 493x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 51.7 ppb, 345x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 31.4 ppb, 314x above the EWG health guideline of 0.1 ppb.
Contact ONSLOW WTR AND SEWER AUTHORITY
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for JACKSONVILLE
Filters matched to the specific contaminants in this water supply.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 66/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
29.6 ppb | 0.06 | — | — | — | — | — | 493× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
51.7 ppb | 0.15 | 80.0 | 100 | — | — | — | 345× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
31.4 ppb | 0.1 | 60.0 | 60 | — | — | — | 314× over |
| Bromodichloromethane Disinfection byproduct |
11.2 ppb | 0.06 | — | — | — | — | — | 187× over |
| Trichloroacetic acid Disinfection byproduct |
11.9 ppb | 0.1 | — | — | — | — | — | 119× over |
| Chloroform Disinfection byproduct |
37.9 ppb | 0.4 | — | — | — | — | — | 95× over |
| Dichloroacetic acid Disinfection byproduct |
18.6 ppb | 0.2 | — | — | — | — | — | 93× over |
| Dibromochloromethane Disinfection byproduct |
2.51 ppb | 0.1 | — | — | — | — | — | 25× over |
| Dibromoacetic acid Disinfection byproduct |
0.3 ppb | 0.03 | — | — | — | — | — | 10× over |
| Chromium (hexavalent) Heavy metal |
0.016 ppb | 0.02 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
161.7 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Bromochloromethane Other |
0.0252 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.105 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
5.22 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.655 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
0.117 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.02 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.178 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0616 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Dalapon Pesticide/Herbicide |
0.548 ppb | — | 200.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
1.11 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
10.8 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
ONSLOW WTR AND SEWER AUTHORITY service area
This water system serves 1 community in Onslow County, North Carolina. Click any city for its dedicated tap water quality page.
Find the right filter for JACKSONVILLE water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.