How many water violations are in Clark County?

Clark County has 9,196 total drinking water violations across 92 water systems, of which 1,614 are health-based violations. 96.7% of systems have at least one violation.

How many people get water from Clark County systems?

Water systems in Clark County serve approximately 106,745 people through 92 public water systems.

Has PFAS been detected in Clark County water?

Under EPA UCMR5, 1 of 5 tested systems in Clark County had at least one PFAS detection (20.0% of the UCMR5-tested subset - not of all 92 SDWIS systems).

What types of water sources supply Clark County?

Water systems in Clark County use GW (92 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. 17.6% of Clark County's violations are health-based. Among counties with any SDWIS violations, this extract puts Clark County in the middle health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

Where does Clark County sit among U.S. counties for water-system population?

According to EPA SDWIS county population served used on /counties, Clark County ranks #544 of 3,254 counties by people served, and #21 of 88 counties in Ohio. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Ohio

Clark County, Ohio

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet OH023 · Clark County 92 sys · 9,196 viol · #544/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-LOW · SRC-GW · SYS-MID · BOOK-FULL

VIOL-SEVERE 96.7% flagged
HEALTH-LOW 17.6% health
RANK-TOP #544/3254
PHOTO-FINISH ±0.1 pp
PFAS-LOW 20.0% detect
SRC-GW GW lead 100%
SYS-MID 92 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Preble County ( -0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Clark County ranks #544 of 3,254 counties by people served, and #21 of 88 counties in Ohio. See methodology · corpus placement.

Clark County standing, mid-flagged corpus third

Flagged-system rate 96.7% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 17.6% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 20.0% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #544 of 3,254 · #21 of 88 in Ohio.

Water Systems

System Name	Population	Violations	PFAS
Springfield City PWS	60,680	12	Clean
Clark County Northridge PWS	8,874	14	Clean
New Carlisle City PWS	5,800	31	Detected
Clark County Park Layne PWS	4,221	25	Clean
Clark County Green Meadows 2 PWS	3,008	5	Clean
Enon Village PWS	2,415	135	-
Tecumseh Schools Main Campus	2,100	90	-
South Charleston Village PWS	1,660	113	-
Youngs Jersey Dairy PWS	1,340	36	-
Clark-Shawnee Local Pk-6 School PWS	1,120	8	-
Shawnee High School	950	28	-
Fairway Terrace MHP PWS	800	118	-
Heart of Ohio Antique PWS	750	13	-
Sims and Murry Marathon PWS	750	9	-
North Hampton Village PWS	538	125	-
Harmony Estates Mobile Home Park	507	32	-
Tomorrows Stars - Back	499	77	-
Brookside Village MHP PWS	475	213	-
Donnelsville Elementary Campus	450	250	-
Chateau Estates MHP PWS	430	110	-
Northeastern Athletic Complex	423	134	-
Locust Hills Golf Club-Clubhouse	400	4	-
South Vienna Village PWS	393	232	-
Clark County Rockway PWS	383	9	-
Clark County Lawrenceville PWS	302	206	-
Ports Petroleum	280	23	-
Garden Acres Water Company PWS	260	14	-
Catawba Village PWS	241	34	-
Mayberry Mini-Mart PWS	237	90	-
Country Haven MHP PWS	234	234	-
Honey Creek Village MHP PWS	225	361	-
Hustead Marathon PWS	225	33	-
Dollar General Springfield Madriver	224	0	-
Dollar General #24617 - New Carlisle	224	4	-
Kone Korner	222	67	-
Clark County Limecrest PWS	215	1	-
571 Grill and Draft House	212	30	-
Greenlawn Condos	203	348	-
Enon Beach Campground	194	26	-
Springfield House Mimis House of Littles	185	375	-
Ipl Dayton Inc	181	268	-
Lawrenceville Church of God PWS	175	9	-
Heritage Fellowship Church	170	70	-
Sugar Isle Golf Course	162	47	-
Risen Christ Lutheran Church PWS	160	116	-
Brookwood MHP PWS	145	80	-
Bethel Community Church of the Nazarene	130	33	-
Greenon Athletic Building	129	188	-
Forest Valley Free Will Bapt Church PWS	125	33	-
Woodbury Apartments PWS	120	1,407	-

Compare beyond Ohio

Mid-flagged peers for Clark County

Cross-state counties nearest Clark County on flagged-system share (96.7%) and cumulative violation count (9,196). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - 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

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

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.