What environmental databases are included?

This page aggregates data from eight EPA databases: Safe Drinking Water (SDWIS), Superfund/NPL sites, Toxic Release Inventory (TRI), Air Quality Index (AQI), Leaking Underground Storage Tanks (LUST), NPDES water discharge permits, RCRA hazardous waste, and Brownfields.

What does the Air Quality Index (AQI) mean?

AQI is measured on a scale from 0 to 500. Values under 50 are 'Good,' 51-100 is 'Moderate,' and above 100 is 'Unhealthy for Sensitive Groups.' AQI is measured at the county level since air quality monitoring stations are sparse. Your town shares its county's AQI reading.

What is a Superfund site?

A Superfund site is a location contaminated by hazardous waste that has been placed on the EPA's National Priorities List (NPL) for long-term cleanup. These sites pose serious risks to human health and the environment. Cleanup can take decades and cost hundreds of millions of dollars.

Ann Arbor, MI

CSADetroit-Warren-Ann Arbor MSAAnn Arbor#1/7 Population

MI EGLE UST / Part 213

Environmental Reporti

326sites monitored

Goodair quality (AQI 41)

Cleanwater compliance

Air Quality

Good

Water Violations

None

Active Contamination

Active Permits

Air quality in Washtenaw County is rated good with a median AQI of 41 (296 days measured in 2025). 0 community water systems serve the area with a clean compliance record. 29 contamination sites are tracked, all with completed or ongoing remediation. 138 EV charging stations are available in the area.

Air Quality — Washtenaw County (2025)i

AQS

The Air Quality Index measures how clean or polluted the air is on a given day. AQI is reported at the county level. A score of 0-50 is considered good; 51-100 is moderate; above 100 may be unhealthy for sensitive groups.

Good

Median AQI

050100150200300

max 152

PM2.5 Daysi

Ozone Daysi

240

Drinking Wateri

SDWIS

Public water systems registered to serve this area. Community systems (CWS) provide water to residents year-round. Violations indicate a system failed to meet federal drinking water standards.

Community Systemsi

Active Systemsi

Recent Violationsi

Transient (34)

Non-Transient (16)

KAISER OPTICAL SYSTEMS, INC.Non-TransientEPA

HENTSCHEL INSTRUMENTSTransientEPA

MOEHRLE, INC.Non-TransientEPA

Industrial Monitoringi

Toxic Release Inventory (TRI)i

TRI

21 facilities

SUPERIOR MATERIALS 38901 S WAGNER RD5 chemicalsTRI

THETFORD CORP7101 JACKSON RD2 chemicalsTRI

U.S. EPA NATIONAL VEHICLE & FUEL EMISSIONS LABORATORY2565 PLYMOUTH RD2 chemicalsTRI

Wastewater & Stormwater Permits (NPDES)i

NPDES

29 active21 expired

HOLIDAY INN EXPRESS & SUITES POOL - ANN ARBOR3853 RESEARCH PARK DRIVEMinor DischargeEPA

OWL CREEK APARTMENTS - ANN ARBOR3400 NIXON ROADMinor DischargeEPA

RACQUET CLUB OF ANN ARBOR3010 HICKORY LANEMinor DischargeEPA

Contamination Sitesi

Contaminated sites tracked by the EPA and state agencies. Superfund sites are the most seriously contaminated locations. Brownfields are former industrial properties being cleaned up for reuse. LUST sites have confirmed leaks from underground storage tanks.

1 Superfund28 Brownfield

BrownfieldDELHI MERCURY SPILL548 W, DELHI RDIn ProgressEPA

BrownfieldUS 23 DOW TRUCK ROLLOVERUS 23 SB AT M-14 EBIn ProgressEPA

BrownfieldNORTH MAPLE AND DEXTER AVENUE512, 516, 522, 540 N. MAPLE RD;In Progress

Brownfield226 WEST LIBERTY226 WEST LIBERTYIn Progress

BrownfieldSHOPS AT WASHTENAW3000,3060,3100 WASHTENAW AVE, 2143,2153 PLATT RDIn Progress

EV Charging & Alternative Fuel Stationsi

AFDC

145total stations

138EV stations

254Level 2 ports

62DC Fast ports

BP_PULSEBlink NetworkChargePoint NetworkEVGATEWAYElectrify AmericaFLONon-NetworkedOpConnectPOWERPUMPRED_ETeslaTesla Destination

407 North Ingalls407 N Ingalls StElectric1 L2FLO

808 E Kingsley St808 E KingsleyElectric2 L2FLO

A2 PARKS A2SENIOR CENTER1320 Baldwin AveElectric2 L2ChargePoint Network