How many water violations are in Lake County?

Lake County has 12,533 total drinking water violations across 108 water systems, of which 865 are health-based violations. 99.1% of systems have at least one violation.

How many people get water from Lake County systems?

Water systems in Lake County serve approximately 539,424 people through 108 public water systems.

Has PFAS been detected in Lake County water?

Under EPA UCMR5, 0 of 17 tested systems in Lake County had at least one PFAS detection (0.0% of the UCMR5-tested subset - not of all 108 SDWIS systems).

What types of water sources supply Lake County?

Water systems in Lake County use GW (95 systems), SW (13 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. 6.9% of Lake County's violations are health-based. Among counties with any SDWIS violations, this extract puts Lake County in the lower health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

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

According to EPA SDWIS county population served used on /counties, Lake County ranks #130 of 3,254 counties by people served, and #2 of 92 counties in Indiana. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Indiana

Lake County, Indiana

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet IN089 · Lake County 108 sys · 12,533 viol · #130/3254

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

VIOL-SEVERE 99.1% flagged
HEALTH-LOW 6.9% health
RANK-TOP #130/3254
PHOTO-FINISH ±0.7 pp
PFAS-CLEAN 0.0% detect
SRC-GW GW lead 88%
SYS-MID 108 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Hancock County ( -0.7 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Lake County ranks #130 of 3,254 counties by people served, and #2 of 92 counties in Indiana. See methodology · corpus placement.

Lake County standing, mid-flagged corpus third

Flagged-system rate 99.1% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 6.9% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #130 of 3,254 · #2 of 92 in Indiana.

Water Systems

System Name	Population	Violations	PFAS
Indiana American Water - Northwest	210,510	15	Clean
Hammond Water Works Department	78,384	38	Clean
Crown Point Water Works	30,000	27	Clean
Schererville Water Department	30,000	23	Clean
East Chicago Water Works	26,370	148	Clean
St. John Municipal Water Utility	25,700	100	Clean
Highland Water Works	23,984	23	Clean
Munster Water Company	23,894	35	Clean
Griffith Water Department	16,893	19	Clean
Dyer Water Department	16,800	12	Clean
Indiana American Water - Lowell	11,908	292	Clean
Cuii - Twin Lakes	8,000	62	Clean
New Chicago Water Works	5,500	31	Clean
Whiting Water Department	4,900	65	Clean
Cedar Lake Water Works	4,600	465	Clean
Cuii - Indiana Water Service	4,200	34	Clean
Pilot/Wendys #448	2,435	312	-
Flying J #653	1,450	387	-
Lowell Commons	1,440	31	-
Aqua Indiana Water Company	1,350	6	-
Cedar Lake - Robins Nest	950	136	-
Apple Valley Utilities, Inc.	712	182	Clean
Luke Oil #293	606	168	-
Winfield Elementary School	546	66	-
Lake Prairie Elementary	540	82	-
Little Calumet River Basin-Artesian Well	500	9	-
Bethel Church Cedar Lake	473	21	-
Dyer Indoor Soccer Arena	302	17	-
Lighthouse Restaurant at Paradise Cove	275	34	-
Schneider Water Department	267	124	-
Lakeshore Subdivision Association, Inc.	265	509	-
Harry Os	220	102	-
Fairway Regional Water District	210	192	-
St. Michael the Archangel Church	200	3	-
Cedar Lake Mobile Home Park	200	1,082	-
Northwest Indiana Islamic Center	199	18	-
Hillside Community Church	190	92	-
Boys and Girls Clubs of NW in-Cedar Lake	160	156	-
Protection of the Virgin Mary Orth Ch	150	13	-
Hanover North Professional Building	150	16	-
Cedar Lake Bible Conference Grounds	150	222	-
Grace Evangelical Lutheran Church	140	4	-
Subway/R.a.k. Holdings LLC	129	15	-
Palmira Golf & Country Club	129	105	-
Holy Name Ch./Grand Tots Daycare	115	25	-
Town of Cedar Lake - Complex & Pumphouse	115	78	-
Ross Baptist Church	110	54	-
Indian Ridge Golf Course	106	112	-
The Sandbar Grill	104	372	-
Tastee Top	104	40	-

Compare beyond Indiana

Mid-flagged peers for Lake County

Cross-state counties nearest Lake County on flagged-system share (99.1%) and cumulative violation count (12,533). 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.