Short answer: Yes. Duluth’s drinking water is drawn from Lake Superior, treated by the city, and tested against federal Safe Drinking Water Act standards, with results published every year. For most households the open question is not the water leaving the treatment plant. It is the service line carrying that water into the house. Duluth has identified 6,800 lead service lines and another 5,500 of unknown material, and the city is replacing them at no cost to property owners.
Where Duluth’s drinking water comes from
Duluth draws its drinking water from Lake Superior. Because that is a surface water source rather than a groundwater well, it is filtered and treated before it enters the distribution system, and it is monitored on a continuous basis.
The Minnesota Department of Health notes in the city’s published report that “one or more sources of your drinking water are susceptible to contamination.” That language appears on most surface water systems in the state. It describes the raw source, not the treated water at your tap, and it is the reason treatment and monitoring exist. MDH maintains a source water assessment for the system, available by calling 1-800-818-9318.
What the city tests and publishes
Every public water system in the United States is required to publish an annual water quality report, sometimes called a Consumer Confidence Report. Duluth’s most recent edition is the 2025 Water Quality Report, available from the City of Duluth.
The report lists what was tested, what was detected, and how each result compares against the federal limit. Reading the current year’s report for yourself is more useful than any summary of it, including this one.
The part the water utility does not control
This is where a careful answer has to get more specific.
A public water system is responsible for the water it treats and for the mains running beneath the street. The pipe that runs from the main into your house is the water service line, and ownership of that pipe is normally divided. As MDH puts it: “Service lines normally are divided in ownership between the city and property owner.”
That distinction matters, because lead does not come from Lake Superior. Where lead appears in tap water, it generally enters from a lead service line, from older solder, or from fixtures inside the home. Water that meets every standard when it leaves the treatment plant can still pick up lead on the last stretch of its journey.
What Duluth’s inventory found
Duluth completed an inventory of its roughly 31,000 water services. It identified 6,800 lead service lines, with a further 5,500 of unknown material. MDH expects the eventual confirmed total to exceed 10,000 once the unknowns are investigated.
Statewide, MDH estimates that roughly 100,000 service lines in Minnesota have the potential to leach lead into the water passing through them.
Those are substantial numbers. They are also the reason a replacement program exists, and the program is well funded.
Replacement is free to the property owner
Duluth is replacing lead service lines at no cost to property owners. The work is funded through the federal Infrastructure Investment and Jobs Act together with a $240 million state grant program, administered through the Drinking Water Revolving Fund. The private portion of each line is covered by grants, and the public portion by a combination of grants and loans. The city’s goal is to replace every lead service line within a decade.
Replacement is carried out through city planned projects rather than by individual request. Property owners in an upcoming project area are notified in advance, often about a year ahead, by mail, email, phone and door knocks. Individual services are generally replaced within a single day.
To check whether your address sits in a current or planned project area, see the city’s Lead Service Line Replacement Map on the Lead Service Line Replacement page, or contact the Lead Removal Program at 218-730-4673 or leadremoval@duluthmn.gov.
How to find out what you have
Three practical steps, in order of effort.
Check the city’s inventory. The lead service line map covers previous, current and planned project areas by address.
Request a water test. The city runs a water testing program for residents who want their own result rather than a system-wide average.
Look at the pipe yourself. Find where the water line enters the basement, usually near the front wall, ahead of the meter. Scratch the surface gently with a coin:
- Lead is a dull gray, soft enough to scratch easily, and reveals a shiny silver streak. A magnet will not stick to it.
- Galvanized steel is gray, harder to scratch, usually threaded at the joints, and a magnet sticks to it.
- Copper scratches to the color of a bright penny.
- Plastic is unmistakable, typically black or blue.
If the line is lead and your address is in a city project, the city program is the route to take. It costs you nothing, and we would rather point you to it.
When a water line is a separate job
Not every service line problem is a lead problem, and not every home sits inside a planned project area.
Galvanized steel lines corrode and close from the inside, which shows up as falling water pressure rather than as a health concern. Lines crack, leak, and freeze. A home may need the work done before the city program reaches that street.
Those are private water line repair and replacement jobs, and they are the work we do, using directional boring where possible so the yard is not trenched end to end.
Common questions
Is Duluth tap water safe to drink?
Yes. Duluth treats Lake Superior water to federal Safe Drinking Water Act standards and publishes an annual water quality report showing what was tested and detected.
Does Duluth tap water contain lead?
Lead is not present in Lake Superior or in the treated water leaving the plant. Where lead is found at a tap, it generally comes from a lead service line, older solder, or fixtures inside the home.
How do I know if I have a lead service line?
Check the City of Duluth’s lead service line map for your address, request a water test through the city, or scratch the pipe where it enters the basement. Lead is dull gray, scratches to shiny silver, and is not magnetic.
Does Duluth pay to replace lead service lines?
Yes. Replacement is at no cost to property owners, funded through federal infrastructure money and a $240 million state grant program. Work is scheduled through city planned projects, and owners are usually notified about a year in advance.
Should I use a filter?
That is a personal decision. If you want certainty about your own tap rather than a system-wide figure, the more direct step is to have your water tested and to confirm what your service line is made of.