Trenton, New Jersey wore its industrial identity with pride — the slogan “Trenton Makes, the World Takes” still spans a bridge over the Delaware River. The city manufactured pottery, wire rope, steel, rubber, and linoleum for more than a century, drawing workers from across the country and the globe. That manufacturing heritage is also a contamination heritage. The land, groundwater, and waterways around Trenton carry the chemical signature of industries that, by modern environmental standards, operated with little concern for what they discharged, buried, or left behind. And like nearly every older American city, Trenton’s water distribution infrastructure includes lead that hasn’t yet been fully removed.
Lead in Trenton’s Water System
Lead contamination in drinking water is an infrastructure problem as much as it is a source water problem. The culprit is typically old lead service lines — the pipes connecting the public water main to individual homes — or lead-containing solder used in household plumbing before it was banned in 1986. When water chemistry allows corrosion, lead leaches from these pipes into the water that comes out of the tap.
Trenton has an aging housing stock. Much of the city’s residential neighborhoods were built in the early-to-mid 20th century, when lead service lines were standard. The city has been working on lead service line replacement, and New Jersey has implemented some of the more aggressive lead service line replacement requirements in the country — a 2021 state law set a 10-year deadline for full replacement statewide.
The city of Trenton’s water utility serves a system with known lead service lines, and prior lead and copper testing results have shown elevations at some sample locations. New Jersey Department of Environmental Protection (NJDEP) maintains oversight of the state’s water utilities under the Lead and Copper Rule. [NEEDS VERIFICATION: most recent Trenton lead testing action level exceedance history]
Trenton’s school water systems have also been a subject of concern. New Jersey passed legislation requiring lead testing in all public school drinking water fixtures, and testing at some Trenton schools found elevated lead levels at specific fixtures, leading to fixture replacement programs. Children are the most vulnerable population for lead exposure — even low levels affect cognitive development and behavior.
Delaware River Source Water
Trenton draws its drinking water from the Delaware River, which serves as the water source for millions of New Jersey residents. The Delaware River Basin Commission (DRBC) oversees water quality management for the entire Delaware River watershed.
The Delaware River has undergone significant cleanup since the Clean Water Act era. The river is dramatically cleaner than it was in the 1960s and 1970s, when industrial discharges had depleted oxygen levels to the point that many fish species couldn’t survive. American shad now run the river. But the cleanup is not complete, and the Delaware still receives inputs from agricultural runoff, urban stormwater, treated sewage, and some industrial sources.
The Delaware River upstream from Trenton receives discharges from New Jersey and Pennsylvania municipalities and industrial facilities. Water quality varies seasonally and with weather events. High-flow periods following rain can increase turbidity, bacteria, and some contaminant concentrations in the river.
Industrial Legacy Contamination
The Chambersburg, Mill Hill, and South Trenton neighborhoods surrounding the former industrial corridor have documented soil and groundwater contamination from manufacturing operations. Ceramic and pottery manufacturing (Trenton was once the “Pottery Capital of the World”), wire rope manufacturing, and rubber production all leave chemical footprints.
Several former industrial sites in Trenton have been designated as NJDEP-regulated contaminated sites under the state’s Industrial Site Recovery Act (ISRA) and related programs. Volatile organic compounds (VOCs) from solvents, heavy metals from manufacturing processes, and petroleum hydrocarbons from fueling operations are among the contaminants documented at former industrial properties.
Groundwater contamination plumes from former industrial sites can migrate toward private wells, though Trenton’s public water supply comes from surface water rather than groundwater. Residents on private wells in adjacent areas should be aware of this context.
The EPA’s National Priorities List (Superfund) includes several sites in Mercer County, New Jersey, in the broader Trenton metro area. Contaminated groundwater from these sites has historically required active remediation to prevent spread. [NEEDS VERIFICATION: current active Superfund remediation status in Mercer County near Trenton]
What the Data Shows
Trenton’s annual Consumer Confidence Report documents the contaminants detected in finished drinking water. Key points to review:
Lead: The Lead and Copper Rule requires testing at the tap in high-risk homes. Results show whether the 90th percentile of tested samples is above or below the action level of 15 parts per billion.
Trihalomethanes and Haloacetic Acids: Delaware River water, like most surface water, contains organic matter that reacts with chlorine during treatment to form DBPs. Trenton’s CCR should include annual average TTHM and HAA levels.
Turbidity: A measure of treatment effectiveness. Consistently low turbidity in finished water indicates that the filtration system is operating well.
Nitrates: Agricultural areas upstream of Trenton contribute nitrates to the Delaware River. Levels have generally been below the EPA MCL of 10 mg/L in treated water.
The Environmental Working Group’s Tap Water Database shows detected contaminants for New Jersey utilities including Trenton, with comparisons to both legal limits and EWG’s more conservative health guidelines.
What Residents Can Do
- Find out if you have a lead service line. New Jersey utilities are required to provide information about service line materials. Contact the Trenton Water Works or check the city’s service line inventory, which is publicly available.
- Test your tap. Even if you don’t have a lead service line, lead-containing solder in household plumbing can contribute to lead levels. Testing costs roughly $20-50 at a certified lab.
- Use a certified lead filter until the pipe is replaced. An NSF/ANSI 53-certified pitcher or under-sink filter rated for lead provides meaningful protection for children and pregnant women while infrastructure work proceeds.
- Run cold water before drinking in the morning. Flush 30 seconds to 2 minutes before using water for drinking or cooking, especially if water has sat in pipes overnight.
- Read your CCR. The Trenton Water Works publishes this annually. Review lead results, DBP levels, and whether any violations occurred during the year.
Water Treatment Options
For lead: reverse osmosis systems and NSF/ANSI 53-certified carbon block filters provide reliable lead reduction. Verify the filter’s NSF certification specifically for lead.
For disinfection byproducts: activated carbon filtration at the point of use is effective for TTHMs and HAAs.
New Jersey’s aggressive lead service line replacement mandate — one of the strongest in the country — sets a clear timeline for eliminating lead pipes statewide. Trenton’s infrastructure improvements, supported by both state and federal funding, are moving forward. But for residents in older homes in the interim, understanding your exposure and taking appropriate precautions matters.
Trenton’s industrial pride built a city and an economy. Cleaning up the legacy of that era is the next chapter in the city’s story, and it’s one where water is central.
If you are concerned about your water quality, a certified water treatment professional can test your water and advise on solutions.