PlainWater
Counties → Michigan

Washtenaw County, Michigan

Water Systems
264
Population Served
420,450
Total Violations
6,092
1,130 health-based
PFAS Detected
4
of 10 tested

Violation Analysis

90.2%
Systems with Violations
23.1
Avg Violations per System
18.5%
Health-Based Violations

Water Source Types

GW
42 systems (16%)
SW
8 systems (3%)

PFAS Contamination

10
Systems Tested
4
PFAS Detected
40.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Washtenaw Michigan water systems by violation status, EPA SDWIS records.

No violations on record (3) One or more violations (47)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Ann Arbor 241,868 119 Detected
Ypsilanti Community Utility Authority 53,988 8 Clean
Pittsfield Township 24,500 21 Clean
Saline 9,158 26 Clean
Scio Township 8,500 20 Detected
Milan 7,363 40 Clean
Superior Township 6,830 9 Detected
Chelsea 5,474 24 Clean
Dexter 4,500 93 Clean
Augusta Township 3,907 11 Clean
Trinity Health Ann Arbor 2,500 0 -
Manchester 2,150 9 -
Mdot - Northfield Church, R814 2,008 2 -
Northville Crossing 1,890 36 -
Northfield Estates 1,620 9 -
Mdot - Chelsea Rest Area 1,614 20 -
Loch Alpine Sanitary Authority 1,506 16 -
Ann Arbor Township 1,338 12 -
Thornton Farms 1,188 17 -
Speedway #8876 1,001 35 -
Independence Lake County Park 930 6 -
DNR-Pinckney Rec Area/Silver Lake 900 5 -
DNR-Pinckney Rec Area/Halfmoon Beach 900 3 -
South Arbor Academy 850 74 -
Chestnut Hills 813 12 -
Fca US LLC/Chelsea Prov Grnds 800 22 -
Orchard Grove 725 11 -
River Ridge - Saline 720 0 -
DNR-Pinckney Rec Area/Bruin Lk Cg-Main W 660 3 -
DNR-Waterloo Rec Area-Sugarloaf Cg 660 3 -
Whitmore Lake Elementary 600 35 -
Calvary Bible Church - Ypsilanti 600 10 -
Blue Heron Bay Spray Zone 510 13 -
Whitmore Lake Hs 500 13 -
St. Joseph Catholic - Dexter 500 12 -
Barton Hills 450 46 -
Emerson School - Elementary 450 42 -
Emerson School - Middle 450 16 -
Salem Elementary School 430 15 -
Salem-South Lyon Dist Library 400 10 -
Knox Presbyterian Church 400 26 -
St. Nicholas Church 400 14 -
Christ Our King Lutheran Church-Addition 400 5 -
Christ Our King Lutheran Church - Church 400 0 -
Saline Valley Farms 375 7 -
Huron Valley Tennis Club 350 21 -
Keystone Church 334 22 -
Westbrook Apartments 330 21 -
Huron River Methodist Church - Church 300 60 -
Wide World Sports Center 300 52 -

Other Counties in Michigan

Wayne County
55 systems · 1,774,820 served · 1,141 violations
Oakland County
742 systems · 1,147,613 served · 21,952 violations
Macomb County
93 systems · 830,956 served · 2,728 violations
Kent County
407 systems · 616,574 served · 4,140 violations
Genesee County
397 systems · 335,433 served · 13,553 violations
Kalamazoo County
195 systems · 286,536 served · 2,453 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Washtenaw County? ▼
Washtenaw County has 6,092 total drinking water violations across 264 water systems, of which 1,130 are health-based violations. 90.2% of systems have at least one violation.
How many people get water from Washtenaw County systems? ▼
Water systems in Washtenaw County serve approximately 420,450 people through 264 public water systems.
Has PFAS been detected in Washtenaw County water? ▼
Of 10 water systems tested for PFAS in Washtenaw County, 4 had PFAS detected (40.0% detection rate).
What types of water sources supply Washtenaw County? ▼
Water systems in Washtenaw County use GW (42 systems), SW (8 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. 18.5% of Washtenaw County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - 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 Editorial

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.