Hamilton, New Jersey Water Outage Today
Live Hamilton water outage reports, Trenton Water Works’s emergency line and the system’s federal record.
Weather data by Open-Meteo.com
No water outage reports in Hamilton, New Jersey in the last 24 hours
Who supplies water in Hamilton?
Hamilton is served by more than one water system: Trenton Water Works, New Jersey American Water. Which one serves your address depends on the neighborhood, and the name on your water bill is the one to call about an outage.
Public water systems in New Jersey are regulated by the New Jersey Department of Environmental Protection (NJDEP).
To report no water or a main break, call Trenton Water Works at 609-989-3222, or New Jersey American Water at 800-272-1325.
Hamilton water system at a glance
Trenton Water Works is the water system EPA lists for Hamilton, serving about 217,000 people.
| Item | Detail |
|---|---|
| Water system in EPA records | Trenton Water Works (NJ1111001) |
| Run by | Local government |
| People served | 217,000 through 62,403 service connections |
| Source of the water | Surface water (rivers, lakes or reservoirs) |
| Active facilities listed by EPA | 1 surface intake, 3 treatment points |
| Connections to other systems | 2 |
| State regulator | New Jersey Department of Environmental Protection (NJDEP) |
| Health-based violations since 2015 | 20 |
| Highest lead result (90th percentile) | 19.7 ppb, action level 15 ppb |
Source: EPA SDWIS (Safe Drinking Water Information System).
What feeds the taps in Hamilton
Tap water in Hamilton starts as surface water. Trenton Water Works takes it from the Delaware River and runs it through treatment before it reaches the mains. Treatment points named in EPA's facility list include Rte 29 Treatment.
Why this matters when the water stops. Because the water is drawn from open surface sources, it has to be filtered and disinfected continuously. A plant problem therefore hits everyone at once, unlike a main break, which only dries up the blocks on either side of the damaged pipe.
Why the water goes out in Hamilton
Water outages are local, so the likely cause depends on weather, pipe age and the grid. For Hamilton, these stand out.
- Freezing weather. Hamilton sees about 79 days a year with a low at or below 32°F, and 13 days at or below 20°F. The coldest morning in the 2015 through 2025 record came on January 7, 2018. The longest stretch with highs that never rose above freezing ran 14 days, ending January 8, 2018. 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. 78.4% of occupied homes in Hamilton 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 46 flood, flash flood and heavy rain reports in Mercer County from 2015 through 2026, and 10 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.
- Long dry spells. The longest stretch without measurable rain since 2015 lasted 41 days, ending November 9, 2024. Dry soil shrinks and shifts around buried pipe, and breaks often cluster when the rain returns and the ground swells again.
- Storm-driven power loss. Thunderstorm wind, hail and tornado reports in Mercer County number 157 since 2015. Pump stations and treatment plants that depend on PSE&G 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.
Freeze, heat and rain: the Hamilton weather record
Main break season in Hamilton runs from late fall into early spring, with the coldest stretch around December through February.
| Measure | Value |
|---|---|
| Days a year at or below 32°F | 79.1 |
| Days a year at or below 20°F | 13.1 |
| Days a year with a high at or below 32°F | 10.7 |
| Days a year at or above 95°F | 0 |
| Days a year at or above 100°F | 0 |
| Days a year with an inch of rain or more | 9.7 |
| Average annual precipitation | 48.3 in |
| Wettest year | 2018 (65.9 in) |
| Driest year | 2025 (39.9 in) |
| Coldest day in the record | January 7, 2018 |
| Hottest day in the record | June 24, 2025 |
Source: NASA POWER daily reanalysis (MERRA-2) for the city center, 2015–2025.
Freezing days peak in January, averaging 23.3 a year. Source: NASA POWER reanalysis, 2015–2025.
The wettest year was 2018 with 65.9 inches; the driest was 2025 with 39.9. Source: NASA POWER reanalysis, 2015–2025.
A note on the numbers: they are modeled for the city center and averaged over eleven years, so they show how often Hamilton sees each kind of weather, not what any one thermometer read on a given day.
Hamilton boil water notices and EPA compliance record
EPA lists 20 health-based violations for Trenton Water Works since 2015, which is more than most systems of its size. It also lists 105 monitoring or reporting entries that are about paperwork rather than water quality, such as a missed sample or a late report.
Most recent health-based entries:
- October 2024: Drinking water above the legal limit for total trihalomethanes
- July 2021: A single turbidity (cloudiness) reading above the limit in treated water It is marked resolved.
- July 2021: Drinking water above the legal limit for total trihalomethanes
| Type of violation | Health-based | Monitoring and other |
|---|---|---|
| Disinfection byproducts | 9 | 24 |
| Surface water treatment and turbidity | 4 | 24 |
| Lead and copper | 7 | 15 |
| Chemical and radiological contaminants | 0 | 25 |
| Coliform bacteria testing | 0 | 13 |
| Public notice and annual reports | 0 | 3 |
Source: EPA SDWIS.
Monitoring and other Health-based
Violations are counted by the year the compliance period began. Source: EPA SDWIS.
When Hamilton loses pressure after a break or a failed test, Trenton Water Works asks affected customers to boil water for drinking and cooking. The notice ends only after samples come back clean, which usually takes one to two days after service returns, and the New Jersey Department of Environmental Protection (NJDEP) supervises the process.
What the lead tests and housing age say about Hamilton
The most recent 90th-percentile lead result filed for Trenton Water Works is 6 ppb (2026). The federal action level is 15 ppb, so that result is well under it.
Highest result on file: 19.7 ppb. Source: EPA SDWIS.
The age of the housing matters more than the utility's test average: 78.4% of occupied homes in Hamilton predate 1970 and 1986 was the year lead pipe and solder were banned. Flush the cold tap after an outage and ask Trenton Water Works whether your service line is on its lead inventory.
How long a water outage lasts in Hamilton
Most repairs of an ordinary main break in Hamilton take half a day once the crew is on site. Bigger mains, deep bury and busy roads stretch that to a day or more.
| Situation | Typical time |
|---|---|
| Planned shutoff | The posted window, though crews often finish ahead of it |
| Ordinary main break | Roughly 4 to 8 working hours |
| Large or deep main | One to three days, longer if parts must be ordered |
| Low pressure after a pump or power failure | Until power returns and tanks recover, often within a day |
| Boil water notice after service returns | One to two days while samples are tested |
| Frozen service line or meter | Until it thaws or a plumber repairs it |
Source: Utility practice, EPA and state boil water guidance.
Trenton Water Works will post an estimated restoration time for a break that affects many customers; ask for the repair crew's estimate when you call.
Preparing for a long water outage in Hamilton
Census figures put the typical Hamilton household at about 2.6 people. At one gallon per person per day that is 8 gallons for three days or 37 gallons for a two-week supply.
- 21.2% of residents are 65 or older (US 17.2%); older adults dehydrate faster and may need help moving heavy water jugs.
- A standard water heater is a ready-made 40-gallon reserve. Shut off its power or gas, open a hot tap somewhere in the house, and draw from the drain valve.
- Fill a tub or large containers early for toilets, cleaning and handwashing, and store drinking water separately in clean bottles.
Hamilton versus neighboring water utilities
| City | System | People served | Source | Health violations since 2015 | Highest lead (ppb) |
|---|---|---|---|---|---|
| Hamilton, NJ | Trenton Water Works | 217,000 | Surface | 20 | 19.7 |
| Edison, NJ | Edison Water Co | 35,000 | Bought (surface) | 3 | 1.6 |
| Toms River, NJ | Veolia Water New Jersey Toms River | 123,184 | Ground | 0 | 3 |
| Philadelphia, PA | Philadelphia Water Department | 1,600,000 | Surface | 0 | 3 |
| Newark, NJ | Newark Water Department | 294,274 | Surface | 24 | 57 |
Source: EPA SDWIS.
Water outage pages for nearby cities
Hamilton boil water notices and main breaks
Trenton Water Works posts Hamilton boil water notices, main breaks and planned shutoffs on its own site and alerts. What a notice requires: water outage guide.
Hamilton frequently asked water questions
Who do I call about no water in Hamilton?
Trenton Water Works at 609-989-3222, day or night. Use 911 only if a main break is flooding property or roads.
Is Hamilton water from a river, lake or well?
Per EPA, the water system for Hamilton (Trenton Water Works) is classed as surface water. It draws from the Delaware River.
Can you drink the tap water in Hamilton?
EPA lists 20 health-based violations for Trenton Water Works since 2015, most recently drinking water above the legal limit for total trihalomethanes in October 2024, and its latest 90th-percentile lead result is 6 ppb against the 15 ppb action level. Follow any boil water notice until the utility says it is over.
When do water mains break most in Hamilton?
Breaks in Hamilton pile up in the cold, with about 79 freezing days a year and the worst stretch from December to February. The days right after a deep freeze, when the soil thaws and shifts, are usually the busiest.
Why is my water pressure low in Hamilton?
A sudden drop usually means a break or valve problem nearby, while a slow decline in the evening points to demand. If the whole street is affected, tell Trenton Water Works; if not, look at your own regulator and shutoff.
How long does a boil water notice last in Hamilton?
Typically a day or two. Bacteria tests take about 24 hours, so Trenton Water Works cannot end a notice until clean samples come back; the New Jersey Department of Environmental Protection (NJDEP) sets the rules for that process.
How much water should a Hamilton household store?
One gallon per person per day is the FEMA minimum. For Hamilton that means about 8 gallons to cover three days for an average household of 2.6, and 37 gallons for two weeks.
Should I worry about lead in Hamilton water?
It depends on the age of your home. About 78.4% of occupied homes in Hamilton were built before 1970, and lead service lines remained legal until 1986. Contact Trenton Water Works about your address and flush the cold tap after any outage.
Where can I see water outages in Hamilton?
This page shows resident reports from Hamilton for the last 24 hours. For a street-by-street picture, use the alerts and outage page of Trenton Water Works; many utilities also text boil notices.
More outage pages for Hamilton and nearby
Other outage types in Hamilton
Water Service Outages in cities near Hamilton
- Trenton, NJ 4 mi · Trenton Water Works
- Edison, NJ 24 mi · New Jersey American Water
- Lakewood, NJ 25 mi · New Jersey American Water
- Woodbridge, NJ 31 mi · Middlesex Water Company
- Toms River, NJ 31 mi · Veolia Water New Jersey
- Philadelphia, PA 32 mi · Philadelphia Water Department · 1 report in 24h
Report counts are user-submitted; other figures name their official source. How our data works
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