ANN ARBOR WWTP

Address

49 SOUTH DIXBORO ROAD
ANN ARBOR, MI 48105
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County

WASHTENAW County

Industry

Utilities

NAICS (North American Industry Classification)

221320

Inspections

8 · last Jan 6, 2026

Total Penalties

$0 · last Sep 15, 1986

Registry ID

110009909313

Compliance Status (Last 12 Quarters)

Number of calendar quarters, out of the last 12, in which this facility was in violation of its permit. Zero means no recorded violations in that program over the past three years.

10

Water (CWA)
Qtrs Non-Compliant

0

Hazardous Waste (RCRA)
Qtrs Non-Compliant

Compliance Violations

Individual permit violations recorded by the EPA across air, water, and hazardous waste programs. Open violations are unresolved as of the most recent ECHO data update.

Program	Type	Violation Date	Return to Compliance	Status
cwa	WW SSO - Discharge to Waters	Oct 4, 2022	—	Open
cwa	Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment	Oct 4, 2022	—	Open
cwa	WW SSO - Discharge to Waters	May 19, 2020	—	Open
cwa	Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment	May 19, 2020	—	Open
cwa	Effluent Violations - Narrative Effluent Violation	Nov 2, 2018	—	Open
cwa	Monitoring Violations - Improper Analysis or Lab Error	Jun 25, 2017	—	Open
cwa	Monitoring Violations - Improper Analysis or Lab Error	May 9, 2017	—	Open
cwa	Monitoring Violations - Improper Analysis or Lab Error	May 8, 2017	—	Open
cwa	Monitoring Violations - Improper Analysis or Lab Error	May 7, 2017	—	Open
cwa	Monitoring Violations - Improper Analysis or Lab Error	May 3, 2017	—	Open
cwa	Schedule Event achieved late but reported	Oct 1, 2014	—	Open
cwa	Schedule Event reported late	Oct 1, 2014	—	Open
cwa	Schedule Event achieved late but reported	Oct 1, 2013	—	Open
cwa	Schedule Event reported late	Oct 1, 2013	—	Open
cwa	Schedule Event reported late	Oct 1, 2012	—	Open
cwa	Schedule Event achieved late but reported	Oct 1, 2012	—	Open
cwa	Schedule Event achieved late but reported	Oct 1, 2011	—	Open
cwa	Schedule Event reported late	Oct 1, 2011	—	Open
cwa	Schedule Event reported late	Oct 1, 2010	—	Open
cwa	Schedule Event achieved late but reported	Oct 1, 2010	—	Open
cwa	Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)	Sep 16, 2008	—	Open
cwa	Pretreatment - Failure to Develop/Enforce Standards	Sep 16, 2008	—	Open
cwa	Permit Violations - Violation Specified in Comment	Jan 31, 1992	Nov 2, 1992	Resolved

Discharge Limit Exceedances

Instances where this facility's reported discharge monitoring results exceeded its permitted limits under the Clean Water Act. Exceedance percentage shows how far over the permit limit the discharge was.

Pollutant	Violation	Reported	Limit	Exceedance	Period	Status
Nitrogen, ammonia total [as N]	DMR, Limited - Numeric Violation	5.60 mg/L	4.00	+40%	Oct 2024	Open
BOD, carbonaceous [5 day, 20 C]	DMR, Limited - Numeric Violation	13.00 mg/L	10.00	+99,999%	Jul 2024	Open
BOD, carbonaceous [5 day, 20 C]	DMR, Limited - Numeric Violation	137.11 kg/d	444.92	+99,999%	Jul 2024	Resolved
BOD, carbonaceous [5 day, 20 C]	DMR, Limited - Numeric Violation	2.00 mg/L	4.00	+99,999%	Jul 2024	Resolved
BOD, carbonaceous [5 day, 20 C]	DMR, Limited - Numeric Violation	263.32 kg/d	1,135.00	+99,999%	Jul 2024	Open
BOD, carbonaceous [5 day, 20 C]	DMR, Limited - Numeric Violation	2.00 mg/L	4.00	+99,999%	Jun 2024	Resolved
BOD, carbonaceous [5 day, 20 C]	DMR, Limited - Numeric Violation	172.97 kg/d	1,135.00	+99,999%	Jun 2024	Open
BOD, carbonaceous [5 day, 20 C]	DMR, Limited - Numeric Violation	110.78 kg/d	444.92	+99,999%	Jun 2024	Resolved
BOD, carbonaceous [5 day, 20 C]	DMR, Limited - Numeric Violation	7.00 mg/L	10.00	+99,999%	Jun 2024	Open
Nitrogen, ammonia total [as N]	DMR, Limited - Numeric Violation	0.80 mg/L	0.50	+60%	Jun 2023	Open
Nitrogen, ammonia total [as N]	DMR, Limited - Numeric Violation	3.30 mg/L	2.00	+65%	Jun 2023	Open
Coliform, fecal general	DMR, Limited - Numeric Violation	497.00 MPN/100mL	400.00	+24%	Jan 2023	Open
BOD, carbonaceous [5 day, 20 C]	DMR, Limited - Numeric Violation	11.00 mg/L	10.00	+10%	Jun 2020	Open
Phosphorus, total [as P]	DMR, Limited - Numeric Violation	1.30 mg/L	1.00	+30%	Jan 2019	Open
Nitrogen, ammonia total [as N]	DMR, Limited - Numeric Violation	2.40 mg/L	2.00	+20%	Sep 2016	Open
Phosphorus, total [as P]	DMR, Limited - Numeric Violation	24.52 kg/d	22.70	+8%	Aug 2015	Open
Phosphorus, total [as P]	DMR, Limited - Numeric Violation	28.15 kg/d	22.70	+24%	Jul 2015	Open
Phosphorus, total [as P]	DMR, Limited - Numeric Violation	29.96 kg/d	27.24	+10%	Jun 2015	Open
Coliform, fecal general	DMR, Limited - Numeric Violation	705.00 MPN/100mL	400.00	+76%	May 2015	Open
Phosphorus, total [as P]	DMR, Limited - Numeric Violation	60.38 kg/d	27.24	+122%	May 2015	Open

Enforcement Actions

Formal enforcement cases brought by the EPA or state agencies, including administrative orders and civil penalties assessed. Penalty amounts reflect what was formally assessed, not necessarily what was collected.

State Administrative Order of Consent

Clean Water Act · Case MI-N00000737 · Sep 3, 2003

Administrative - Formal

· Case 05-1986-0256 · Sep 15, 1986

$4,960

State CWA Non Penalty AO

Clean Water Act · Case MI-N00000029 · Jun 2, 1986

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