Manchester, New Hampshire Water Outage Today

Manchester water system at a glance

The system behind most taps in Manchester is Manchester Water Works, which EPA records list as serving roughly 123,500 people.

Where Manchester's tap water comes from

Tap water in Manchester starts as surface water. Manchester Water Works takes it from Lake Massabesic /Raw and runs it through treatment before it reaches the mains. Treatment points named in EPA's facility list include Treatment Plant /Finished and Merrimack Rvr Treatment Plant.

What this means in an outage. A surface-water system depends on its plant staying online. If the plant, the raw-water pumps or the power feeding them fails, pressure can fall across the entire service area at once, and a precautionary boil notice tends to cover whole zones rather than the single street of a main break.

Why the water goes out in Manchester

These are the causes that match the record for Manchester, listed roughly in order of how much they matter here.

• Freezing weather. Manchester sees about 138 days a year with a low at or below 32°F, and 53 days at or below 20°F. The coldest morning in the 2015 through 2025 record came on February 24, 2015. The longest stretch with highs that never rose above freezing ran 29 days, ending February 21, 2015. Frozen service lines and meters cause single-address outages, while ground frost and thaw cycles crack older mains and produce the street-wide breaks.
• Older neighborhoods and pipe. 53.2% of occupied homes in Manchester 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 55 flood, flash flood and heavy rain reports in Hillsborough County from 2015 through 2026, and 8 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 Hillsborough County number 204 since 2015. Pump stations and treatment plants that depend on Eversource run on the electric grid, so a storm that downs power lines can lower water pressure even when no pipe is damaged.
• Digging and utility work. Street projects, fiber installation and excavation near buried pipe regularly cut mains in Manchester with no warning, usually on a day with perfectly ordinary weather.
• Planned shutoffs and a problem at one address. Valve replacements and new connections are announced ahead, often with door hangers. If neighbors have water, check your own shutoff valve, meter and pressure regulator before calling.

How weather strains the Manchester water system

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

The figures are reanalysis estimates for the center of Manchester, not readings from a single weather station, so treat them as a guide to how often each kind of weather occurs rather than as official records.

Boil water advisories and the federal violation record for Manchester

Since 2015, EPA's record for Manchester Water Works shows no health-based violations.

A boil water notice in Manchester is a separate thing from a violation. Manchester Water Works issues one when pressure falls low enough for contamination to enter the pipes, after a main break is repaired, or when a routine test comes back positive. The New Hampshire Department of Environmental Services (NHDES) oversees the process, and the notice stays until clean samples come back, usually a day or two after pressure returns.

Lead service lines and old plumbing in Manchester

The most recent 90th-percentile lead result filed for Manchester Water Works is 0 ppb (2024). The federal action level is 15 ppb, so that result is well under it.

53.2% of occupied homes in Manchester 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 Manchester Water Works about its lead service line inventory.

When will the water come back on in Manchester?

Most repairs of an ordinary main break in Manchester take half a day once the crew is on site. Bigger mains, deep bury and busy roads stretch that to a day or more.

Ask Manchester Water Works for a restoration estimate when you report the outage; for large breaks it is normally posted and updated as the repair progresses.

Emergency water storage for Manchester households

Census figures put the typical Manchester household at about 2.4 people. At one gallon per person per day that is 7 gallons for three days or 33 gallons for a two-week supply.

• 18.4% of homes are in buildings with 20 or more units. Upper floors lose pressure first, and rooftop tanks and booster pumps depend on building power.
• 51.3% of households rent. Tell your landlord or property manager about a leak or outage right away, since the shutoff valve may be theirs.
• Do not forget the water heater: the tank holds roughly 30 to 50 gallons you can drink after it is switched off and allowed to cool.
• If a planned shutoff or storm is coming, fill the tub and some buckets for flushing toilets and washing; keep drinking water in clean sealed containers.

Manchester versus neighboring water utilities

Water outage pages for nearby cities

Nashua, NH · Lowell, MA · Cambridge, MA · Boston, MA