How many water violations are in Will County?

Will County has 37,818 total drinking water violations across 330 water systems, of which 2,453 are health-based violations. 76.4% of systems have at least one violation.

How many people get water from Will County systems?

Water systems in Will County serve approximately 622,572 people through 330 public water systems.

Has PFAS been detected in Will County water?

Under EPA UCMR5, 9 of 23 tested systems in Will County had at least one PFAS detection (39.1% of the UCMR5-tested subset - not of all 330 SDWIS systems).

What types of water sources supply Will County?

Water systems in Will County use GW (306 systems), SW (24 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. 6.5% of Will County's violations are health-based. Among counties with any SDWIS violations, this extract puts Will County in the lower health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

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

According to EPA SDWIS county population served used on /counties, Will County ranks #112 of 3,254 counties by people served, and #4 of 102 counties in Illinois. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Illinois

Will County, Illinois

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet IL197 · Will County 330 sys · 37,818 viol · #112/3254

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

VIOL-SEVERE 76.4% flagged
HEALTH-LOW 6.5% health
RANK-TOP #112/3254
PHOTO-FINISH ±0.3 pp
PFAS-MID 39.1% detect
SRC-GW GW lead 93%
SYS-LARGE 330 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: McLean County (+ 0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Will County ranks #112 of 3,254 counties by people served, and #4 of 102 counties in Illinois. See methodology · corpus placement.

Will County standing, lower-flagged corpus third

Flagged-system rate 76.4% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 6.5% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 39.1% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #112 of 3,254 · #4 of 102 in Illinois.

Water Systems

System Name	Population	Violations	PFAS
Joliet	160,000	380	Clean
IL American-West Suburban	73,978	21	Clean
Romeoville	50,458	266	Detected
Plainfield	50,000	182	Clean
New Lenox	27,690	41	Clean
IL American-Homer Township	24,543	2	Clean
Frankfort	24,000	91	Clean
Lockport	23,100	197	Detected
Crest Hill	21,169	190	Detected
Mokena	19,887	51	Clean
Shorewood	18,645	105	Detected
Channahon	13,380	138	Detected
Manhattan	10,340	178	Clean
Crete	8,275	26	Clean
Aqua Illinois-University Park	7,002	24	Detected
Braidwood	6,194	165	Clean
Wilmington	5,624	335	Detected
Monee	5,148	265	Clean
Aqua Illinois-Willowbrook	5,100	15	Clean
Beecher	4,713	28	Clean
Aqua Illinois-Peotone	4,182	27	Clean
Elwood	2,229	292	-
Rockdale	2,012	341	-
Southeast Joliet SD	2,000	338	-
St Bernards Church	1,600	0	-
Pheasant Lake Estates MHP	1,528	20	-
Exxon Mobil Oil Refinery	1,450	372	-
Crystal Lawns Addition Improvement Assoc	1,435	227	Detected
Bonnie Brae Forest Manor Sndst	1,338	14	-
East Moreland Wtr Service Assn	1,320	154	-
IL American-Arbury	1,225	157	-
Stateville Correctional Center	992	300	-
Lockport Heights SD	984	19	-
Gateway MHP	884	11	-
Lakewood Shores Improvement Association	868	248	-
Prairie Path Water Company-Cherry Hill	833	21	-
Aqua Illinois-Village Woods	800	38	-
Braidwood Generating Station	800	132	-
Prairie Path Water Company-Camelot	777	48	-
Ingalls Park Subdivision	744	50	-
Christian Life Church	730	0	-
Gas City 143rd Street	700	0	-
Merichkas	700	244	-
Lakepoint Club C/O George Kappos	650	40	-
Balmoral Elem	645	55	-
Channahon East	630	206	-
Isle a la Cache Museum	600	0	-
Three Rivers Church	600	0	-
Baker Koren Round Barn	600	1	-
College View Subdivision	570	238	-

Compare beyond Illinois

Lower-flagged peers for Will County

Cross-state counties nearest Will County on flagged-system share (76.4%) and cumulative violation count (37,818). 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.