How many water violations are in Ogle County?

Ogle County has 8,348 total drinking water violations across 112 water systems, of which 560 are health-based violations. 93.8% of systems have at least one violation.

How many people get water from Ogle County systems?

Water systems in Ogle County serve approximately 45,754 people through 112 public water systems.

Has PFAS been detected in Ogle County water?

Under EPA UCMR5, 0 of 3 tested systems in Ogle County had at least one PFAS detection (0.0% of the UCMR5-tested subset - not of all 112 SDWIS systems).

What types of water sources supply Ogle County?

Water systems in Ogle County use GW (112 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. 6.7% of Ogle County's violations are health-based. Among counties with any SDWIS violations, this extract puts Ogle County in the lower health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

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

According to EPA SDWIS county population served used on /counties, Ogle County ranks #1,012 of 3,254 counties by people served, and #28 of 102 counties in Illinois. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Illinois

Ogle County, Illinois

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet IL141 · Ogle County 112 sys · 8,348 viol · #1012/3254

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

VIOL-SEVERE 93.8% flagged
HEALTH-LOW 6.7% health
RANK-UPPER #1012/3254
PHOTO-FINISH ±0.4 pp
PFAS-CLEAN 0.0% detect
SRC-GW GW lead 100%
SYS-MID 112 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Rock Island ( -0.4 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Ogle County ranks #1,012 of 3,254 counties by people served, and #28 of 102 counties in Illinois. See methodology · corpus placement.

Ogle County standing, mid-flagged corpus third

Flagged-system rate 93.8% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 6.7% 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 #1,012 of 3,254 · #28 of 102 in Illinois.

Water Systems

System Name	Population	Violations	PFAS
Rochelle	9,446	87	Clean
Byron	4,743	423	Clean
Oregon	3,449	54	Clean
Mount Morris	2,861	200	-
Polo	2,355	78	-
Davis Junction	2,344	0	-
Forreston	1,338	9	-
Hillcrest	1,224	225	-
Stillman Valley	1,200	20	-
White Pines Forest St Park-Lodge/Cabins	750	5	-
White Pines Forest St Park-Cedar Ridge	750	5	-
Lost Lake Utility District	704	254	-
Creston	627	42	-
Kilbuck Creek Retreat	604	10	-
Constellation Byron Generating Station	600	0	-
Maxson Manor	562	9	-
Jarrett Prairie Center	520	11	-
Aqua Illinois-Nordic Woods	500	294	-
Shangri-La MHP	475	16	-
Rolling Meadows Mhc	447	51	-
Leaf River	403	20	-
Ed Etnyre and Company	400	125	-
Mount Morris Estates MHP	395	185	-
Monroe Center School - Old Well	380	1,144	-
Monroe Center School - New Well	380	388	-
Aqua Illinois-Woodlawn	375	24	-
Oregon Tool	350	239	-
Prairie Path Water Company-Rockvale	298	63	-
Camp Emmaus	250	22	-
Camp Lowden - Thunderhawk Well	250	8	-
Camp Lowden - Pool/Dining	250	8	-
Camp Lowden - Main Office	250	8	-
Cross Roads Community Church	225	287	-
Lake Ladonna Family Campground	200	15	-
Lowden State Park - West Well	200	9	-
Stronghold Kitchen	200	7	-
Bishop Lane Retreat Center	200	0	-
Double O Saloon	200	31	-
Rolling Green Estates MHP	191	38	-
Eswood School Dist 269	175	112	-
Camp McCormick - Troophouse	150	2	-
Lake Louise Campground - Beach Well	150	22	-
Kings Community School	150	75	-
River Road Marina & Camping	150	29	-
Lake Louise Campground - West Well	150	23	-
Lake Louise Campground - Middle Well	150	41	-
Little Prairie Mennonite Church	140	0	-
Country View Estates Subdivision	125	42	-
The Kitchen Table	125	13	-
White Pines Ranch	125	8	-

Compare beyond Illinois

Mid-flagged peers for Ogle County

Cross-state counties nearest Ogle County on flagged-system share (93.8%) and cumulative violation count (8,348). 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.