Public water system record
Ann Arbor
Serves Ann Arbor, Washtenaw County, MI · 123,851 people served
Federal records show no health-based violations and 1 monitoring/reporting issue for Ann Arbor in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 1
Key facts
- Ann Arbor draws water from 3 wells and 2 surface water intakes.
- Most recent formal enforcement: administrative penalty by Michigan, November 2008.
- Record on file since 1993, with 30 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 2 unknown out of 25,875 service lines.
Check whether Ann Arbor serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Cryptosporidium
Monitoring and reporting
|
Nov 1, 2016 | Resolved |
Full record since 1993
EPA's records for Ann Arbor go back to 1993. Before October 19, 2016 they list 30 health-based violations (13 resolved, 17 archived by EPA without a recorded fix) and 11 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 25 | 3 |
| 2000s | 5 | 7 |
| 2010 to October 18, 2016 | 0 | 1 |
| October 19, 2016 to 2019 | 0 | 1 |
Most recent health-based violation before October 19, 2016: Interim Enhanced Surface Water Treatment Rule (acute), began January 2008, Resolved.
Show all 30 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Jan 1, 2008 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Jul 1, 2006 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Jun 1, 2006 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Mar 1, 2002 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Feb 1, 2002 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 1996 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 1996 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 1996 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 1995 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Aug 1, 1995 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 1995 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 1995 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 1995 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 1995 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 1995 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 1995 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 1995 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Dec 1, 1994 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Nov 1, 1994 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 1994 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 1994 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Aug 1, 1994 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 1994 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 1994 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 1994 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 1994 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 1994 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Dec 1, 1993 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Nov 1, 1993 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 1993 | Archived |
Enforcement actions
Michigan regulators took 3 formal enforcement actions against Ann Arbor between 1993 and 2008. The most recent was an administrative penalty in November 2008.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Nov 26, 2008 | Michigan | Administrative penalty | 1 violation: Endothall |
| Jul 16, 2003 | Michigan | Administrative penalty | 1 violation: Total Coliform |
| Jun 29, 1993 | Michigan | Compliance order (no penalty) | 5 violations (5 health-based): Surface Water Treatment Rule |
Where the water comes from
Ann Arbor draws water from 3 wells and 2 surface water intakes. 2 other community water systems buy water from Ann Arbor.
Community systems that buy water from it
- Ann Arbor Township Ann Arbor, MI
- Scio Township Ann Arbor, MI
Annual water quality report
Ann Arbor must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Michigan.
Certified drinking water labs by state EPA guidance for private wells