How many water violations are in Monroe County?

Monroe County has 1,845 total drinking water violations across 82 water systems, of which 458 are health-based violations. 96.3% of systems have at least one violation.

How many people get water from Monroe County systems?

Water systems in Monroe County serve approximately 136,030 people through 82 public water systems.

Has PFAS been detected in Monroe County water?

Under EPA UCMR5, 2 of 6 tested systems in Monroe County had at least one PFAS detection (33.3% of the UCMR5-tested subset - not of all 82 SDWIS systems).

What types of water sources supply Monroe County?

Water systems in Monroe County use GW (73 systems), SW (9 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. 24.8% of Monroe County's violations are health-based. Among counties with any SDWIS violations, this extract puts Monroe County in the higher health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

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

According to EPA SDWIS county population served used on /counties, Monroe County ranks #455 of 3,254 counties by people served, and #13 of 83 counties in Michigan. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Michigan

Monroe County, Michigan

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet MI115 · Monroe County 82 sys · 1,845 viol · #455/3254

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

VIOL-SEVERE 96.3% flagged
HEALTH-MID 24.8% health
RANK-TOP #455/3254
PHOTO-FINISH ±0.2 pp
PFAS-MID 33.3% detect
SRC-GW GW lead 89%
SYS-MID 82 systems
BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Monroe County ranks #455 of 3,254 counties by people served, and #13 of 83 counties in Michigan. See methodology · corpus placement.

Monroe County standing, mid-flagged corpus third

Flagged-system rate 96.3% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 24.8% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 33.3% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #455 of 3,254 · #13 of 83 in Michigan.

Water Systems

System Name	Population	Violations	PFAS
Monroe	49,467	20	Clean
Monroe South County	33,816	12	Clean
Frenchtown Township	16,481	168	Detected
Berlin Township	9,900	10	Clean
Ash Township	5,959	5	Clean
Dundee	5,400	28	Detected
South Rockwood	1,587	14	-
Mdot - Dundee W.C., R822	1,407	11	-
Petersburg	1,115	66	-
K.O.A. Campground	1,006	16	-
Crossroads Community Church	950	17	-
Hidden Lake Resort	520	8	-
American Legion Post 514	500	10	-
The Legacy	350	21	-
Whiteford Township	303	149	-
Dollar General #14643 - Carleton	300	5	-
Dundee Sportsmans Club	250	14	-
Sidelines Sports Eatery & Pub	250	19	-
Fieldstone Church	250	44	-
Mason Jar Tap and Grill	200	20	-
Covered Wagon Campground	200	25	-
Kc Campground	200	14	-
Icmc Campground - East Well	200	27	-
Icmc Campground - West Well	200	11	-
Luis' Kitchen	200	18	-
Pirolli Park	196	10	-
St. Michael Lutheran Church	180	5	-
A.j's Doolittles	175	7	-
Brookwood Swim Club	160	9	-
Bedford Meadows	156	11	-
New Life Church of Open Bible	150	12	-
Whiteford Valley Golf	150	26	-
Erie United Methodist Church	150	10	-
Lafiesta Corporation	150	0	-
Bedford Senior Cit Ctr	130	12	-
Cornerstone Baptist Church	130	0	-
VFW #9656	124	24	-
Literal Life	120	7	-
Ottawa Lake Sportsmen Club, Inc	120	30	-
Midwest II, Inc.	120	63	-
Charlie Mops	110	19	-
Applewood Orchards, Inc (New Camp)	105	5	-
Masonic Lodge #438	100	29	-
Dusseau's Reception Center	100	12	-
Nike Park Recreation Area	100	37	-
Immanuel Luth Church-Ida	100	24	-
Bolster Family Golf Course	100	4	-
Ida Gas Station	100	23	-
Bob's Country Market	100	25	-
Summerfield Market	100	13	-

Compare beyond Michigan

Mid-flagged peers for Monroe County

Cross-state counties nearest Monroe County on flagged-system share (96.3%) and cumulative violation count (1,845). 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.