PlainWater
Counties → Ohio

Seneca County, Ohio

Water Systems
64
Population Served
47,390
Total Violations
5,533
882 health-based
PFAS Detected
1
of 2 tested

Violation Analysis

95.3%
Systems with Violations
86.5
Avg Violations per System
15.9%
Health-Based Violations

Water Source Types

GW
46 systems (72%)
SW
4 systems (6%)

PFAS Contamination

2
Systems Tested
1
PFAS Detected
50.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Seneca Ohio water systems by violation status, EPA SDWIS records.

No violations on record (3) One or more violations (47)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Aqua Ohio - Tiffin 20,035 42 Clean
Fostoria City 13,441 43 Clean
Green Springs Village 1,592 157 -
Attica Village 1,148 412 -
Bloomville Village 956 90 -
Hopewell-Loudon School 890 0 -
Bettsville Village 692 118 -
All Saints Catholic Church 590 8 -
Republic Village 550 42 -
New Riegel Local School 524 51 -
Meadowbrook Park Campground 2 428 13 -
Old Fort High School 315 48 -
S and G Store #77 300 3 -
Fostoria Mobile Estates 281 1,067 -
Walnut Grove Campground No 1 233 65 -
New Riegel Cafe 227 30 -
Dollar General Store - Bettsville #14997 225 0 -
Tiffin Drive-in Theater 210 39 -
American Legion Post 354- New Riegel 200 53 -
Clinton Lake Camping 2 200 88 -
The Corner Restaurant 200 12 -
Hopewell-Loudon Athletic Complex 200 9 -
Meadowbrook Park Campground 1 198 8 -
Clinton Heights Golf Course 180 37 -
Old Fort United Methodist Church 179 0 -
Walnut Grove Campground No 2 153 61 -
Camp Glen 152 133 -
I C Treats 150 4 -
Lindsey-Shook Funeral Home 150 8 -
Seneca Country Market 150 67 -
Walnut Grove Campground No 3 136 91 -
Evergreen Poplar Village MHP 128 178 -
Meadowbrook Park-Pool 126 4 -
Eci Inc Corporate Office 125 51 -
Mohawk Golf and Country Club 125 17 -
Loudon Meadows Golf Course 112 45 -
NW Ohio Christian Youth Camp 1 100 70 -
NW Ohio Christian Youth Camp 2 100 15 -
New Riegel Pub 100 51 -
Hopewell-Loudon School Gym Complex 100 48 -
Guru Junction 100 59 -
The Front Nine 100 52 -
Old Fort School Athletic Complex 100 115 -
All Saints Parish Hall 100 4 -
Clinton Lake Camping 1 87 99 -
Tiffin Loader Crane Company 85 150 -
Brook Park Estates MHP 75 350 -
First Christian Church 75 94 -
Fostoria Estates MHP 65 359 -
Walts Tavern 65 57 -

Other Counties in Ohio

Franklin County
96 systems · 1,503,985 served · 5,342 violations
Cuyahoga County
11 systems · 1,410,751 served · 1,166 violations
Hamilton County
28 systems · 842,267 served · 1,480 violations
Montgomery County
74 systems · 529,379 served · 4,724 violations
Summit County
214 systems · 467,695 served · 17,163 violations
Lucas County
46 systems · 433,198 served · 3,569 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Seneca County? ▼
Seneca County has 5,533 total drinking water violations across 64 water systems, of which 882 are health-based violations. 95.3% of systems have at least one violation.
How many people get water from Seneca County systems? ▼
Water systems in Seneca County serve approximately 47,390 people through 64 public water systems.
Has PFAS been detected in Seneca County water? ▼
Of 2 water systems tested for PFAS in Seneca County, 1 had PFAS detected (50.0% detection rate).
What types of water sources supply Seneca County? ▼
Water systems in Seneca County use GW (46 systems), SW (4 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 15.9% of Seneca County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

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 page draws directly on 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.