How many water violations are in Hamilton County?

Hamilton County has 6,714 total drinking water violations across 66 water systems, of which 569 are health-based violations. 97.0% of systems have at least one violation.

How many people get water from Hamilton County systems?

Water systems in Hamilton County serve approximately 229,377 people through 66 public water systems.

Has PFAS been detected in Hamilton County water?

Under EPA UCMR5, 1 of 4 tested systems in Hamilton County had at least one PFAS detection (25.0% of the UCMR5-tested subset - not of all 66 SDWIS systems).

What types of water sources supply Hamilton County?

Water systems in Hamilton County use GW (64 systems), SW (2 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. 8.5% of Hamilton County's violations are health-based. Among counties with any SDWIS violations, this extract puts Hamilton County in the lower health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

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

According to EPA SDWIS county population served used on /counties, Hamilton County ranks #297 of 3,254 counties by people served, and #4 of 92 counties in Indiana. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Indiana

Hamilton County, Indiana

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet IN057 · Hamilton County 66 sys · 6,714 viol · #297/3254

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

VIOL-SEVERE 97.0% flagged
HEALTH-LOW 8.5% health
RANK-TOP #297/3254
PHOTO-FINISH ±0.0 pp
PFAS-MID 25.0% detect
SRC-GW GW lead 97%
SYS-MID 66 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Jay County (+ 0 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Hamilton County ranks #297 of 3,254 counties by people served, and #4 of 92 counties in Indiana. See methodology · corpus placement.

Hamilton County standing, mid-flagged corpus third

Flagged-system rate 97.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 8.5% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 25.0% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #297 of 3,254 · #4 of 92 in Indiana.

Water Systems

System Name	Population	Violations	PFAS
Carmel Water Department	99,927	23	Clean
Citizens Water of Westfield, LLC	61,493	304	Clean
Indiana American Water - Noblesville	45,575	1	Detected
Cicero Water Department	5,607	19	Clean
Indiana American Water - Sheridan	4,435	9	-
Ruoff Music Center	2,000	64	-
Arcadia Water Department	1,515	31	-
Bethel Lutheran Church	860	9	-
Atlanta Water Department	735	60	-
Emmanuel United Methodist Church	450	406	-
Durbin School	415	41	-
Becks Superior Hybrids	408	15	-
Hamilton Co Parks & Rec-White River Camp	400	26	-
Carmel Clay Water	393	6	-
Ritz Charles	390	192	-
Suburban Estates, LLC	350	144	-
Crossroads Community Church	252	128	-
Kids on the Rock Daycare	250	436	-
Mooreco IV, Dba McDonalds - Fishers	222	153	-
Sheridan Six Points Wesleyan	210	12	-
Legacy Bible Church, Inc.	202	13	-
Purgatory Golf Club	200	26	-
Flowing Well	200	14	-
McClures Store #65	164	37	-
Faith Temple Dba Fuel Church	152	48	-
East Union Christian Church	150	25	-
Stony Creek Golf Course - Shelter	133	12	-
Hamilton County Regional Utility	125	0	-
Indiana Academy	113	233	-
Strawtown Koteewi Park	104	15	-
Family River Life, Inc	100	142	-
Eagletown Estates Mobile Home Park	97	55	-
Eagletown Roadside Cafe	93	178	-
Tall Timbers Mobile Home Park	90	78	-
Diabetes Youth Foundation - Bath/Dining	86	96	-
Diabetes Youth Foundation	86	82	-
Reynolds Farm Equipment	80	233	-
Bear Slide Golf Club	75	42	-
Martin Marietta - Noblesville Stone	71	16	-
Clarksville Christian	70	6	-
Spectrum Brands (North)	70	315	-
Spectrum Brands (South)	70	283	-
Open Door Free Methodist Church	65	68	-
Country Moon Winery	62	13	-
Victory Chapel Community Church	60	72	-
The Cooper House, Inc	52	11	-
Lifepointe Church	52	55	-
Palomino Ballroom, Inc.	50	15	-
Journey Church	50	48	-
Indiana Trap Shooters Assoc.	50	254	-

Compare beyond Indiana

Mid-flagged peers for Hamilton County

Cross-state counties nearest Hamilton County on flagged-system share (97.0%) and cumulative violation count (6,714). 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.