South Portland, Maine Water Outage Today

South Portland tap water system, by the numbers

Portland Water District-Greater is the water system EPA lists for South Portland, serving about 135,068 people. Customers know it as Portland Water District; the name on your bill is the one to call.

Source water and treatment in South Portland

South Portland drinks surface water. Portland Water District-Greater draws it from rivers, lakes or reservoirs and treats it before it goes into the distribution system. Treatment points named in EPA's facility list include Treatment Plant 1. After treatment the water is held in 9 storage tanks and reservoirs, which is the buffer that keeps taps running for a few hours after a pump or main fails.

What this means in an outage. Surface water needs a treatment plant running around the clock, so a plant shutdown, a raw-water pump failure or a long power cut at the plant can lower pressure across the whole service area, not just on one street. Boil water notices are more likely to be citywide after that kind of failure than after a single main break.

Why the water goes out in South Portland

Which failures hit South Portland hardest follows from its weather, its housing stock and how it is supplied.

• Freezing weather. South Portland sees about 72 days a year with a low at or below 32°F, and 17 days at or below 20°F. The coldest morning in the 2015 through 2025 record came on February 4, 2023. The longest stretch with highs that never rose above freezing ran 12 days, ending February 17, 2015. Frost pushes into shallow service lines first. Mains follow when the ground heaves and thaws, which is why break counts climb a day or two after the temperature swings.
• Older neighborhoods and pipe. 51.1% of occupied homes in South Portland were built before 1970, against 35.5% nationally. Streets of that age tend to sit on cast iron and early steel mains that are near or past their design life, which is where most breaks start.
• Flooding and heavy rain. NOAA logged 34 flood, flash flood and heavy rain reports in Cumberland County from 2015 through 2026, and 12 days a year bring an inch of rain or more. High water can wash out the ground under buried pipe, flood pump stations and push treatment plants past their limits, which is why boil notices so often follow a flood.
• Storm-driven power loss. Thunderstorm wind, hail and tornado reports in Cumberland County number 165 since 2015. Pump stations and treatment plants that depend on Central Maine Power run on the electric grid, so a storm that downs power lines can lower water pressure even when no pipe is damaged.
• Damage from other crews. Water mains share the ground with gas, power and telecom lines, and a strike by any contractor can dry up a block in seconds.
• One-address problems. A closed valve, a meter swap or a failed regulator can leave a single house dry. Compare notes with a neighbor first; if they have water too, start with your own plumbing.

South Portland weather and water-main stress, 2015–2025

Main break season in South Portland runs from late fall into early spring, with the coldest stretch around December through February.

A note on the numbers: they are modeled for the city center and averaged over eleven years, so they show how often South Portland sees each kind of weather, not what any one thermometer read on a given day.

Boil water advisories and the federal violation record for South Portland

Since 2015, EPA's record for Portland Water District-Greater shows no health-based violations. It also lists 6 monitoring or reporting entries that are about paperwork rather than water quality, such as a missed sample or a late report.

Most recent entries, all monitoring or reporting:

• October 2022: A missed or late disinfection byproduct monitoring sample It is marked resolved.
• October 2022: A missed or late disinfection byproduct monitoring sample It is marked resolved.

Boil water notices in South Portland are precautions, not findings. When pressure drops, Portland Water District tells affected customers to boil water until two rounds of lab tests are clean, a process that normally takes 24 to 48 hours after service is restored, under oversight from the Maine CDC Drinking Water Program.

Lead, older pipes and water quality in South Portland

The most recent 90th-percentile lead result filed for Portland Water District-Greater is 1.9 ppb (2023). The federal action level is 15 ppb, so that result is well under it.

51.1% of occupied homes in South Portland were built before 1970, and lead service lines and solder stayed legal until the federal ban in 1986. After any outage that disturbs the pipes, run the cold tap 30 seconds to 2 minutes before drinking, and ask Portland Water District about its lead service line inventory.

Restoration times for water outages in South Portland

A crew that arrives at an ordinary main break in South Portland usually needs 4 to 8 hours to isolate the pipe, dig, repair, flush and restore pressure. Large transmission mains, deep pipes and breaks under busy streets can take a day or more.

For a break that affects many customers, Portland Water District usually posts an estimated restoration time. When you call, ask the dispatcher what the crew has told them.

Preparing for a long water outage in South Portland

The average household in South Portland has about 2.2 people, so FEMA's minimum of one gallon per person per day comes to roughly 7 gallons for three days and 31 gallons for two weeks.

• 20.7% of residents are 65 or older (US 17.2%); older adults dehydrate faster and may need help moving heavy water jugs.
• Your water heater tank holds 30 to 50 gallons of clean water. Turn off the power or gas to it first, then drain from the valve at the bottom.
• Fill a tub or large containers early for toilets, cleaning and handwashing, and store drinking water separately in clean bottles.

Water systems near South Portland, side by side

Water outage pages for nearby cities

Lewiston, ME · Manchester, NH · Nashua, NH · Lowell, MA