County · Michigan

Washtenaw County, Michigan: drinking water records

Name: Drinking water records for Washtenaw County, Michigan
Creator: U.S. Environmental Protection Agency
License: https://www.usa.gov/government-works

Explore EPA records for 32 community water systems across 14 ZIP codes in Washtenaw County, then find water-testing resources and available recent monitoring-station readings.

In focus32Community water systems

Public records. Clearer context.

Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages

Drinking-water records

EPA survey and compliance records are historical reports. UCMR 5 results are available for 10 of the 32 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.

systems in EPA's PFAS survey

systems where PFAS was found

systems at or above the PFOA or PFOS limit, on the yearly-average basis EPA uses

systems that have reached the lead action level

systems with a health-based violation since 2016

System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.

Water systems in this county

All 32 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.

Water system	People served	PFAS survey results	PFAS found	Health-based violations	Lead, 9 in 10 homes at or below
Superior Township MI0006490	6,830	240	1	1	0 ppbbelow the action level
Ann Arbor MI0000220	123,851	120	3	0	2.3 ppbbelow the action level
Ypsilanti Community Utility Authority MI0007260	53,988	120	0	0	4.1 ppbbelow the action level
Pittsfield Township MI0005360	24,500	120	0	0	0 ppbbelow the action level
Saline MI0005900	9,158	60	0	0	0 ppbbelow the action level
Scio Township MI0005977	8,500	120	3	0	0 ppbbelow the action level
Milan MI0004380	7,363	60	0	0	5.1 ppbbelow the action level
Chelsea MI0001370	5,474	60	0	0	0 ppbbelow the action level
Dexter MI0001810	4,500	120	0	0	0 ppbbelow the action level
Augusta Township MI0000321	3,907	120	0	0	0 ppbbelow the action level
Saline Valley Farms MI0005901	375	0	0	1	0 ppbbelow the action level
Westbrook Apartments MI0007035	330	0	0	1	2 ppbbelow the action level
Regency at Whitmore Lake MI0067101	190	0	0	1	5 ppbbelow the action level
St. Louis Center MI0006325	56	0	0	4	0 ppbbelow the action level
Manchester MI0004020	2,150	0	0	0	4.9 ppbbelow the action level
Northville Crossing MI0040657	1,890	0	0	0	5 ppbbelow the action level
Northfield Estates MI0040594	1,620	0	0	0	0 ppbbelow the action level
Loch Alpine Sanitary Authority MI0003940	1,506	0	0	0	7.2 ppbbelow the action level
Ann Arbor Township MI0000221	1,338	0	0	0	1.1 ppbbelow the action level
Thornton Farms MI0006594	1,188	0	0	0	3 ppbbelow the action level
Andelina Farms MI0000215	750	0	0	0	4 ppbbelow the action level
Orchard Grove MI0040503	725	0	0	0	2 ppbbelow the action level
River Ridge - Saline MI0040663	720	0	0	0	2 ppbbelow the action level
Barton Hills MI0000430	450	0	0	0	1 ppbbelow the action level
Harbor Cove Apartments MI0003001	288	0	0	0	5 ppbbelow the action level
Austin Commons II MI0000322	280	0	0	0	1 ppbbelow the action level
Sylvan Township MI0006531	263	0	0	0	0 ppbbelow the action level
Village at Eagle Gardens MI0007099	193	0	0	1	not reported
Copper Meadows MI0001631	128	0	0	0	4 ppbbelow the action level
Sisters of Mary, Mother of Eucharist MI0006074	100	0	0	0	0 ppbbelow the action level
Pleasant Lake Park LLC MI0040504	60	0	0	0	1 ppbbelow the action level
Chestnut Hills MI0001397	813	0	0	0	not reported

USGS · Monitoring stations

The water, more recently.

Available station readings in Washtenaw County, Michigan. Each measurement keeps its time, unit and original source.

These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.

Recent observations load when this section comes into view.

How these readings update

We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.

Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.

Your next step

Water testing, reports & local help.

Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.

Official national directories

Water testing

Find your state’s private-well program

EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-05

Water testing

Find a certified drinking-water laboratory

Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-11

Public records

Find your utility’s Consumer Confidence Report

EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-09-09

Public records

Explore USGS water observations

Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.

U.S. Geological Survey
Source reviewed 2026-09-15

A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.

Understand water testing and laboratory reports

Resource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction

Explore your area

Local coverage in Washtenaw County

14ZIP areas in this overview

Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.

Towns and communities

Ann Arbor
Chelsea
Dexter
Manchester
Saline
Whitmore Lake
Ypsilanti

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

48103Ann Arbor
48104Ann Arbor
48105Ann Arbor
48108Ann Arbor
48109Ann Arbor
48118Chelsea
48130Dexter
48158Manchester
48176Saline
48189Whitmore Lake
48190
48191
48197Ypsilanti
48198Ypsilanti

These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.

Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.

Beyond this county page

Keep reading. Compare nearby.

PFASChoosing a PFAS filterPFAS was found in 3 of the 10 systems EPA surveyed here. See how to check a filter’s certified PFAS reduction.LeadChoosing a lead filter7 systems here have reached the lead action level. See how to check a filter’s lead-reduction certification.Your utilityFind your annual water reportConfirm the supplier on your bill, then read its Consumer Confidence Report for local results.

Counties near Washtenaw County

All Michigan counties

Sources and scope

EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.

Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.

Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.