Detroit's water story is more nuanced than the Flint association might suggest. The Great Lakes Water Authority (GLWA), which treats water for Detroit and 126 surrounding municipalities serving roughly 3.9 million people in southeast Michigan, draws from Lake Huron and the Detroit River — two of the world's largest freshwater sources. That source advantage is real.
The challenge is infrastructure: pre-1945 lead service lines in older Detroit neighborhoods, a 90th percentile lead level in 2023 testing of 9 ppb that crept to 13 ppb in 2024 (still below the federal action level of 15 ppb, but above Michigan's new stricter 12 ppb standard), and an industrial legacy on the Detroit River that creates ongoing PFAS and chemical concerns in some parts of the system.
Detroit is not Flint. But the lead situation warrants attention, and Michigan now has the toughest lead-in-water standards in the country — which means more Detroit-area systems are being flagged for action than before.
Where Detroit's Water Comes From
The Great Lakes Water Authority operates four water treatment plants with intakes from:
- Lake Huron — clean, deep freshwater, relatively low organic content
- The Detroit River — the connection between Lake St. Clair and Lake Erie; high flow rate that dilutes contamination, but an industrial corridor history
After GLWA treatment, water is delivered to Detroit Water and Sewerage Department (DWSD), which distributes it through approximately 2,700 miles of water mains throughout the city.
The industrial caveat: The Detroit River is designated an EPA Area of Concern due to decades of industrial use along its banks. The most acute current concern is the BASF Wyandotte facility, which has a contaminated groundwater plume leaching approximately 60 gallons per minute of water containing PFAS, mercury, arsenic, and benzene into the river. Environmental advocates have pushed for more aggressive remediation — regulators have outlined cleanup plans, but a real treatment solution for the source contamination is not expected until 2027 at the earliest.
GLWA monitors contaminants near its intakes and uses granular activated carbon and other treatment steps. The agency reports that PFAS is consistently non-detect in treated finished water. The distance between the BASF site and GLWA's main intakes, combined with the river's high flow volume, provides substantial dilution. But residents who want extra reassurance have reason to use point-of-use filtration.
The Lead Situation: Pre-1945 Homes Are the Risk
Detroit stopped allowing lead service line installation in 1945 — earlier than the federal 1986 lead solder ban. This means:
- Homes built before 1945 may have lead service lines (the pipe from the street main to the house)
- Homes built 1945–1986 may have lead solder at copper pipe joints but not lead service lines
- Homes built after 1986 have no lead components in new plumbing
In a city with Detroit's age and housing profile, pre-1945 homes are common across much of the east side, west side, and inner-ring neighborhoods.
2024 testing results: Detroit Water and Sewerage Department reported a 90th percentile lead level of 13 ppb — compliant with the federal 15 ppb action level, but above Michigan's new stricter 12 ppb standard that took effect in 2025. Michigan's Lead and Copper Rule, enacted in 2018 and updated since, is now the toughest in the country.
What GLWA and DWSD are doing:
- GLWA increased orthophosphate (corrosion inhibitor) dosing in late 2024, aiming to double levels by February 2025. Orthophosphate coats the interior of pipes, reducing lead dissolution
- Detroit Water and Sewerage reported replacing more than 8,000 lead service lines in the 14 months prior to the reporting period — a dramatic acceleration from prior years
- Michigan law requires replacement of all lead service lines by 2041
- Detroit received $90 million in federal infrastructure funding specifically for lead pipe replacement
The broader Metro Detroit picture: A February 2025 Planet Detroit analysis found that several Metro Detroit systems surpassed the old 15 ppb standard in 2024. Systems including Harper Woods (15 ppb), Warren (14 ppb), Dearborn, Inkster, Taylor, and Wayne all had lead levels that exceed Michigan's new 12 ppb threshold. About 1.2 million Metro Detroit residents are served by systems whose last test cycle would have exceeded the new standard.
Private wells: More than 165,000 private wells exist in Oakland, Wayne, Macomb, Washtenaw, and Livingston counties. Private well owners should test for PFAS — 59 southeast Michigan water systems have shown detectable PFAS levels, primarily from military bases and industrial sources in the region.
PFAS in Metro Detroit
GLWA's own treated water tests negative for PFAS — the authority has tested annually since 2009. However, Planet Detroit's analysis of state data found detectable PFAS in some raw/untreated GLWA source water samples taken as research, and some GLWA member communities have reported positive results in their own distribution systems.
The PFAS picture in southeast Michigan is complicated by the industrial history. Fort Custer, Wurtsmith Air Force Base, Selfridge Air National Guard Base, and various industrial sites have all contributed to PFAS groundwater contamination in the region. Communities relying on groundwater wells (not GLWA surface water) have faced the most significant PFAS issues.
For Detroit City proper (served by GLWA surface water treatment), PFAS in finished water is not currently a detected concern. For suburban and rural residents on private wells or smaller groundwater-based systems, testing is recommended.
What's in Detroit Tap Water in 2026
Lead: Moderate Concern in Pre-1945 Homes
- 90th percentile: 13 ppb (2024) — below federal 15 ppb action level, above Michigan's new 12 ppb standard
- Corrosion inhibitor (orthophosphate) has been increased; active service line replacement underway
- Primary risk in homes built before 1945
Disinfection Byproducts: Moderate, Within Limits
- Lake Huron source water has relatively low organic content compared to river systems like the Chattahoochee or Mississippi
- TTHMs and HAA5s are present at moderate levels — lower than Atlanta or San Diego but not zero
- Within federal MCLs
PFAS: Below Detection in GLWA Finished Water
- GLWA has not detected PFAS in treated drinking water since testing began in 2009
- Some suburban groundwater systems have PFAS detections
- Detroit River industrial contamination is a background concern but treated effectively
Hardness: 6–9 GPG — Moderately Hard
- Lake Huron water is moderately hard — noticeable scaling on fixtures but not extreme
- Full softener is optional; many Detroit residents manage without one
Source Water Industrial Legacy
- Detroit River EPA Area of Concern designation
- BASF Wyandotte plume: contaminated groundwater entering river; treatment expected 2027
- GLWA monitoring, dilution, and treatment provide a multilayer barrier between industrial contamination and the tap
→ Check your specific Detroit ZIP code's water quality at PureCity
Filter Recommendations for Detroit
The primary filter concern in Detroit is lead from pre-1945 plumbing. DBPs are moderate, PFAS not currently detected in city water. This suggests a targeted lead-reduction filter rather than necessarily a full RO system for most households.
Pre-1945 Detroit homes — the priority:
- Clearly Filtered Pitcher (~$90) — independently certified for lead and 360+ contaminants; strongest non-RO pitcher option
- Frizzlife SK99 Under-Sink Filter (~$90) — NSF 53 certified for lead; under-sink carbon block; good for Detroit's water profile
- PUR PLUS Faucet Filter (~$35) — NSF 53 certified for lead; easiest installation; good for renters
If you want comprehensive protection (lead + PFAS + DBPs):
- APEC ROES-50 (~$215) — NSF 58 certified RO; most thorough protection; appropriate for high-risk older homes with children or pregnant residents
Post-1945/newer construction:
- Detroit's treated water is clean at the plant level. Moderate DBP reduction with a standard NSF 42/53 carbon filter is adequate — the Brita Elite (~$40) is a reasonable option for taste and minor contaminant reduction
Private well users in Metro Detroit:
- Test first — contact Michigan EGLE or use Tap Score testing (~$150–200)
- If PFAS detected, RO is required
Free Resources for Detroit Residents
- Free water testing: Detroit residents with lead service lines or children with elevated blood lead levels can request free testing from DWSD. Contact: detroitmi.gov/departments/water-and-sewerage-department
- Service line lookup: Check your address at detroitmi.gov to see your service line material
- Lead service line replacement: If you have a confirmed lead service line, contact DWSD about the replacement program
The Bottom Line for Detroit Residents
Detroit's GLWA water is genuinely among the better-treated large urban water supplies in the US — Great Lakes source water, sophisticated treatment, and PFAS-free at the tap. The primary concern is lead from pre-1945 interior plumbing, which is being actively addressed through accelerated service line replacement and increased corrosion inhibitor dosing.
If you're in a pre-1945 home, use an NSF 53 certified lead filter and check your service line status. If you're in newer construction, Detroit's water quality is good and basic filtration is optional rather than urgent.
Related Articles
- Lead in Drinking Water Filters: What Brita Won't Tell You
- Flint, Michigan Water Quality 2026: The Road to Recovery After the Crisis
- Best Water Filter for Older Homes: Lead Solder, Galvanized Pipes, and What to Buy
- PFAS in Drinking Water: What It Is, Where It's Found, and How to Filter It
Sources: Detroit Water and Sewerage Department: Lead and Drinking Water · Planet Detroit: Lead Exposure — Michigan Water Systems Exceed New Lead Limits, February 2025 · Planet Detroit: PFAS in Metro Detroit's Drinking Water, June 2024 · Frizzlife: Water in Detroit — Detroit Water Quality Problems · Great Lakes Water Authority: Water System · EWG Tap Water Database: Detroit · Michigan Lead and Copper Rule