Trenton Water Works issued a precautionary boil water advisory on August 4, 2026, after a 16-inch water main broke on Olden Avenue in Ewing Township, cutting pressure across a wide swath of Mercer County. Here is what the advisory covers and what homeowners in the area should do while it remains in effect.
What Happened on Olden Avenue
The break hit a 16-inch main running along Olden Avenue, on the stretch near Arctic Parkway in Ewing Township, causing a sudden and significant drop in system pressure. Trenton Water Works, which supplies the affected section of Mercer County, responded by issuing a precautionary boil water advisory on August 4, 2026, covering portions of both Ewing and Lawrence townships while repair crews worked the break.
The break was severe enough that some businesses between Parkside Avenue and Pennington Road were told they would be without water entirely until at least the following morning, on top of the boil water requirement covering the broader surrounding area.
Why a Pressure Drop Triggers a Boil Water Advisory
Utilities issue precautionary boil water advisories after a main break because a sudden loss of pressure can allow groundwater or other contaminants to be drawn into the pipe network through the break itself or through fittings elsewhere in the system, a phenomenon utilities call backsiphonage. Trenton Water Works has stated that no impact on water quality had been identified as of the advisory, which is why it is being treated as precautionary rather than confirmed contamination.
That distinction matters for how seriously residents should treat the advisory. A precautionary advisory means treat the water as if it could be affected until testing proves otherwise, not that a specific contaminant has already been detected. Laboratory confirmation that the water is safe again typically takes 24 to 48 hours from the time testing begins.
What Residents in the Affected Streets Should Do
The affected zone stretches across roughly a dozen streets in the two townships. It runs along both sides of North Olden Avenue and reaches side streets such as Glen Mawr Drive and Green Lane on one end, and out toward Lawrenceville Road, Fairfield Avenue, and Pennington Avenue on the other. Anyone on or near those blocks, or told directly by Trenton Water Works that they are included, should get tap water to a full boil, keep it boiling for a full minute, and let it cool before using it for drinking, cooking, brushing teeth, or making ice, or switch to bottled water for those purposes instead. A standard home water filter pitcher is not a substitute for boiling or bottled water during this kind of advisory.
Residents should watch for the official all-clear from Trenton Water Works through its website, social media, or local news before returning to normal tap water use, since the timeline depends on when lab testing is completed rather than a fixed calendar date. Anyone with questions about whether their specific address is included can call Trenton Water Works Community Relations directly.
Source: Trenton Water Works precautionary boil water advisory notice, August 4, 2026
6 Things to Do During a Boil Water Advisory
A precautionary boil water advisory changes how a household should handle tap water until testing confirms it is safe again. These are the practical steps that matter most.
- Boil tap water for one full minute before drinking it: Bring water to a rolling boil for at least one minute and let it cool before use, which is the standard method utilities recommend for this kind of advisory.
- Use boiled or bottled water for cooking and ice: Any water that touches food directly, including ice cube trays, should be boiled or bottled during the advisory.
- Don't rely on a home filter pitcher as a substitute: Standard countertop or pitcher filters are not certified to remove the type of contamination a pressure-loss advisory is meant to guard against.
- Check whether your specific street is on the affected list: Boil water advisories are often issued for a defined zone, so confirming your address is actually included avoids unnecessary disruption or a false sense of safety.
- Watch for the official all-clear before resuming normal use: Advisories are lifted based on lab results, not a fixed schedule, so wait for a direct notice from the utility rather than guessing when it has passed.
- Call ahead if a business needs water service confirmed: Restaurants, salons, and other water-dependent businesses in the affected zone should confirm restoration status directly with the utility before reopening normal operations.
Frequently asked questions
- Has contamination been confirmed in the Ewing-Lawrence water supply?
- No. Trenton Water Works described the advisory as precautionary because the pressure loss from the main break could allow contaminants to enter the system, not because contamination has been detected. Lab testing determines whether the advisory can be lifted.
- How long does a boil water advisory like this typically last?
- Trenton Water Works said lab testing to clear this kind of advisory typically takes 24 to 48 hours from when testing begins, though the exact timeline depends on results and is announced through the utility's official channels.
- Does a boil water advisory mean I shouldn't shower or wash dishes?
- Advisories like this one are generally focused on water that is ingested, meaning drinking, cooking, and ice, rather than bathing or washing dishes with detergent and hot water, though residents with specific concerns should check the utility's guidance for their advisory.
- What should I do if I'm not sure whether my address is included?
- Trenton Water Works published a specific list of affected streets and offered a Community Relations phone number for residents to confirm whether their address falls inside the advisory zone.