How many water violations are in Madison County?

Madison County has 6,897 total drinking water violations across 59 water systems, of which 769 are health-based violations. 94.9% of systems have at least one violation.

How many people get water from Madison County systems?

Water systems in Madison County serve approximately 44,857 people through 59 public water systems.

Has PFAS been detected in Madison County water?

Under EPA UCMR5, 0 of 4 tested systems in Madison County had at least one PFAS detection (0.0% of the UCMR5-tested subset - not of all 59 SDWIS systems).

What types of water sources supply Madison County?

Water systems in Madison County use GW (59 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. 11.1% of Madison County's violations are health-based. Among counties with any SDWIS violations, this extract puts Madison County in the middle health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

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

According to EPA SDWIS county population served used on /counties, Madison County ranks #1,026 of 3,254 counties by people served, and #46 of 88 counties in Ohio. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Ohio

Madison County, Ohio

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet OH097 · Madison County 59 sys · 6,897 viol · #1026/3254

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

VIOL-SEVERE 94.9% flagged
HEALTH-LOW 11.1% health
RANK-UPPER #1026/3254
PHOTO-FINISH ±0.2 pp
PFAS-CLEAN 0.0% detect
SRC-GW GW lead 100%
SYS-MID 59 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Mahoning County ( -0.2 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Madison County ranks #1,026 of 3,254 counties by people served, and #46 of 88 counties in Ohio. See methodology · corpus placement.

Madison County standing, mid-flagged corpus third

Flagged-system rate 94.9% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 11.1% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #1,026 of 3,254 · #46 of 88 in Ohio.

Water Systems

System Name	Population	Violations	PFAS
London City PWS	10,256	153	Clean
Mid-Ohio WSD Water District 1	5,176	37	Clean
West Jefferson Village PWS	4,488	29	Clean
Mid-Ohio WSD Plain City WTP	4,467	174	Clean
Travel Centers of America	2,490	183	-
Choctaw Utilities, Inc.	2,200	72	-
Mount Sterling Village PWS	2,059	253	-
Speedway 5360 PWS	1,006	26	-
Jehovah Witness Assembly Hall	800	33	-
Green Meadows Mobile Home Park	730	43	-
Tolles Technical Center	723	12	-
Madison Plains Elementary School	721	141	-
Jonathan Alder Pioneer High School PWS	683	25	-
Suburbans Community MHP	655	157	-
Waffle House 716 PWS	614	27	-
Odot Rest Area 6-21 PWS	600	34	-
Madison Plains High School	593	138	-
Odot Rest Area 6-22 PWS	500	4	-
Canaan Middle School	450	28	-
Jonathan Alder Junior High School	426	240	-
Canaan Community MHP	420	16	-
Jefferson Lodge Mobile Home	400	30	-
South Solon Village PWS	395	134	-
S S Simon and Jude Catholic Church PWS	350	8	-
Monroe Elementary School	287	31	-
Life in Christ Fellowship PWS	250	0	-
Shekinah Christian School PWS	240	528	-
Dollar General #20756 - Mount Sterling	223	21	-
Battelle-West Jefferson	220	42	-
United Bethel Mennonite Church	220	419	-
Rosedale Bible Institute	175	206	-
Greentree Mobile Home Park	170	353	-
Bp Oil at 56 and 71	150	112	-
Faith Assembly Worship Center	130	128	-
Ohio Peace Officer Training Academy-Tact	120	16	-
Procter Conference Center	110	28	-
Plainview Christian School	100	215	-
Buckeye Ford Inc	100	843	-
National Road Golf Course	100	18	-
Spring Valley MHP	96	268	-
Jehovah Witness Kingdom	80	54	-
London Christian Fellowship PWS	80	8	-
Holmes Lumber Dublin PWS	70	0	-
London Country Club	66	47	-
Holiday Inn Express	65	32	-
Newport Cccu PWS	56	7	-
Lafayette United Methodist Church PWS	50	3	-
Community Freewill Baptist Church	50	122	-
London Baptist Church	50	12	-
Vaughn C. Darding, D.C.	50	65	-

Compare beyond Ohio

Mid-flagged peers for Madison County

Cross-state counties nearest Madison County on flagged-system share (94.9%) and cumulative violation count (6,897). 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.