Water Quality in 48103 — Ann Arbor, MI
EPA data for ANN ARBOR
Data source: U.S. Environmental Protection Agency (EPA) SDWIS Last verified: March 16, 2026
Your Water System
ZIP code 48103 in Ann Arbor, Michigan is served by ANN ARBOR (EPA ID: MI0000220). This system provides water to approximately 241,868 people from surface water sources.
There are 10 community water systems serving this area.
Lead & Copper in Your Water
No Lead & Copper Rule sampling data available for systems serving this ZIP code.
Violation Summary
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 1, 2025 | Surface Water Treatment Rule | Monitoring | Unresolved |
| November 11, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| November 11, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| November 11, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| November 11, 2023 | Consumer Confidence Report Rule | Monitoring | Resolved |
| November 11, 2023 | Consumer Confidence Report Rule | Monitoring | Resolved |
| November 11, 2023 | Consumer Confidence Report Rule | Monitoring | Resolved |
| October 1, 2023 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| October 1, 2023 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| October 1, 2023 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| October 1, 2023 | Haloacetic Acids (HAA5) | Monitoring | Unresolved |
| October 1, 2023 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| October 1, 2023 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
| October 1, 2023 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
| October 1, 2023 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
| October 1, 2023 | Total Trihalomethanes (TTHM) | Monitoring | Unresolved |
| October 1, 2023 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for water systems serving this ZIP code:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 9 | No |
| Consumer Confidence Report Rule | Reporting | 6 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 5 | No |
| Surface Water Treatment Rule | Treatment Technique | 2 | No |
| Stage 1 DBP Rule | Treatment Technique | 2 | No |
Need help with your water quality?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| ANN ARBOR | MI0000220 | 241,868 | Surface water |
| PITTSFIELD TOWNSHIP | MI0005360 | 24,500 | Surface water |
| SCIO TOWNSHIP | MI0005977 | 8,500 | Surface water |
| LOCH ALPINE SANITARY AUTHORITY | MI0003940 | 1,506 | Groundwater |
| ANN ARBOR TOWNSHIP | MI0000221 | 1,338 | Surface water |
What You Can Do
- Review your annual Consumer Confidence Report (CCR) — Your utility publishes this each July
- Test your home’s water — Especially if you have older plumbing (pre-1986) that may contain lead
- Stay informed — Bookmark this page to check for updates on your water quality
Need help with water testing or filtration?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Other Water Quality Reports in Michigan
- 48007 (Troy) — 2 violations
- 48009 (Birmingham) — 16 violations
- 48033 (Southfield) — 28 violations
- 48035 (Clinton Township) — 18 violations
- 48042 (Macomb) — 4 violations
- 48043 (Mount Clemens) — 20 violations
- 48047 (New Baltimore) — 3 violations
- 48048 (New Haven) — 2 violations
- 48060 (Port Huron) — 3 violations
- 48067 (Royal Oak) — 6 violations
- 48088 (Warren)
- 48094 (Washington) — 1 violation
- 48111 (Belleville) — 27 violations
- 48114 (Brighton)
- 48120 (Dearborn)
- 48125 (Dearborn Heights) — 26 violations
- 48150 (Livonia)
- 48201 (Detroit)
- 48301 (Bloomfield Hills) — 2 violations
- 48306 (Rochester)
Nearby Water Quality Reports
- 48111 (Belleville) — 16 mi — 27 violations
- 48374 (Novi) — 19 mi
- 48114 (Brighton) — 20 mi
- 48150 (Livonia) — 22 mi
- 48843 (Howell) — 24 mi — 16 violations
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for ANN ARBOR (MI0000220) on EPA.gov.
Frequently Asked Questions
Is the tap water in 48103 safe to drink?
Based on EPA records, the water system serving ZIP code 48103 has only monitoring/reporting violations, which are procedural in nature. However, individual home conditions (old pipes, well water) can affect quality.
Where does 48103’s water come from?
The primary water source for this area is surface water. ANN ARBOR serves approximately 241,868 people.
How can I get my water tested?
Contact your local water utility for a free water quality report, or hire a certified lab for independent home water testing. The EPA recommends testing annually if you use a private well.
Does 48103 have lead in the water?
No Lead and Copper Rule sampling data is currently available in EPA records for water systems serving ZIP code 48103. If you are concerned about lead, contact your water utility or have your tap water independently tested.
What is the radon risk in 48103?
Radon zone data is not available for ZIP code 48103. The EPA recommends testing all homes for radon regardless of location, as radon levels can vary significantly even within the same neighborhood.