Water Quality Report · Updated October 07, 2026
WARREN COUNTY
WARREN COUNTY delivers tap water graded D (59/100) by TapWaterSafety.org. The utility serves approximately 81,975 residents in LEBANON, Ohio using groundwater. The most significant water quality concerns are: PFAS contamination; Haloacetic acids (HAA9) significantly above health guideline; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. For questions, the utility can be reached at 513-695-1377.
Is LEBANON tap water safe to drink?
WARREN COUNTY delivers tap water that earns a grade of D (59/100) from TapWaterSafety.org — a below-average rating, with multiple concerns including pfas contamination.
The utility serves 81,975 residents in LEBANON, drawing from groundwater.
Public testing data identifies 16 contaminants in this water above EWG's health-based guidelines, including: Perfluorooctane sulfonate (PFOS), Haloacetic acids (HAA9), Perfluorohexane sulfonate (PFHXS), Total trihalomethanes (TTHMs), Bromodichloromethane, Dibromochloromethane, Dibromoacetic acid, Haloacetic acids (HAA5), Perfluorononanoic acid (PFNA), Chloroform, Nitrate, Dichloroacetic acid, Trichloroacetic acid, Perfluorooctanoic acid (PFOA), Bromoform, Nitrate and nitrite. 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.
EPA compliance record
Official U.S. EPA records for WARREN COUNTY (system ID OH8301512) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Consumer Confidence Rule | Other (e.g. public notice) | 11/09/2018 | Open |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Quick actions for LEBANON residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for WARREN COUNTY.
PFAS contamination
Severe concernPerfluorononanoic acid (PFNA), Perfluorooctane sulfonate (PFOS) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 11.8 ppb, 197x above the EWG health guideline of 0.06 ppb.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 0.164 ppt, 164x above the EWG health guideline of 0.001 ppt.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 17.2 ppb, 115x above the EWG health guideline of 0.15 ppb.
Contact WARREN COUNTY
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 LEBANON
Filters matched to the specific contaminants in this water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
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 59/100 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 |
|---|---|---|---|---|---|---|---|---|
| Perfluorooctane sulfonate (PFOS) PFAS |
15.3 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | EPA violation |
| Haloacetic acids (HAA9) Disinfection byproduct |
11.8 ppb | 0.06 | — | — | — | — | — | 197× over |
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.164 ppt | 0.001 | 10.0 | — | — | — | — | 164× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
17.2 ppb | 0.15 | 80.0 | 100 | — | — | — | 115× over |
| Bromodichloromethane Disinfection byproduct |
4.57 ppb | 0.06 | — | — | — | — | — | 76× over |
| Dibromochloromethane Disinfection byproduct |
5.14 ppb | 0.1 | — | — | — | — | — | 51× over |
| Dibromoacetic acid Disinfection byproduct |
1.15 ppb | 0.03 | — | — | — | — | — | 38× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
3.52 ppb | 0.1 | 60.0 | 60 | — | — | — | 35× over |
| Perfluorononanoic acid (PFNA) PFAS |
0.088 ppt | 0.006 | 10.0 | — | — | — | — | 15× over |
| Chloroform Disinfection byproduct |
4.13 ppb | 0.4 | — | — | — | — | — | 10× over |
| Nitrate Inorganic |
0.914 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 6.5× over |
| Dichloroacetic acid Disinfection byproduct |
1.18 ppb | 0.2 | — | — | — | — | — | 5.9× over |
| Trichloroacetic acid Disinfection byproduct |
0.583 ppb | 0.1 | — | — | — | — | — | 5.8× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.361 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 4.0× over |
| Bromoform Disinfection byproduct |
1.94 ppb | 0.5 | — | — | — | — | — | 3.9× over |
| Nitrate and nitrite Inorganic |
0.5 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 3.6× over |
| Chlorate Disinfection byproduct |
50.5 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
85.2 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
1.54 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
1.62 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.283 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.329 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.392 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.97 ppm | — | 4.0 | 1.5 | 1.5 | — | — | 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.
WARREN COUNTY service area
This water system serves 1 community in Warren County, Ohio. Click any city for its dedicated tap water quality page.
Find the right filter for LEBANON water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.