New Jersey leads the nation in PFAS regulation, with enforceable state MCLs for three PFAS compounds set in 2020 – years before the federal government acted. Pennsylvania follows federal standards and faces significant lead infrastructure challenges, particularly in Philadelphia and Pittsburgh. New Jersey has the stronger regulatory framework; Pennsylvania has more unaddressed legacy contamination.
Pennsylvania and New Jersey share the Delaware River watershed and similar industrial histories, but their regulatory responses to water contamination couldn't be more different. New Jersey became the national model for state-level PFAS regulation. Pennsylvania is still catching up, hampered by aging infrastructure and a decentralized approach to water quality oversight.
This article contains affiliate links. If you buy through them, we may earn a small commission at no extra cost to you.
New Jersey's Department of Environmental Protection (DEP) was the first state agency to set enforceable PFAS MCLs, adopting limits of 14 ppt for PFOA, 13 ppt for PFOS, and 13 ppt for PFNA in 2020. These limits drove utilities to invest in treatment years before the EPA's 2024 federal rule. Pennsylvania's Department of Environmental Protection follows federal standards and has set MCLs for only PFOA (18 ppt) and PFOS (18 ppt) as of 2023.
Pennsylvania operates approximately 2,100 community water systems serving 10.5 million people. New Jersey has about 600 community systems serving 8.3 million. The size difference reflects Pennsylvania's more rural character – many small systems serve Appalachian and agricultural communities. Check your water quality by zip code for system-level data.
New Jersey's higher detection rate reflects both intensive contamination and thorough testing. The state's industrial corridor along the Passaic River, combined with former military sites like the Naval Weapons Station Earle and Joint Base McGuire-Dix-Lakehurst, created widespread contamination. According to NJ DEP data from 2025, over 150 public water systems in New Jersey required PFAS treatment upgrades to meet state limits.
Pennsylvania's PFAS hot spots include the former Naval Air Station Willow Grove (now Horsham Air Guard Station) in Bucks County, where PFAS contamination affected private wells and public water systems across multiple townships. The Warminster-Horsham-Warrington area has some of the highest documented PFAS levels in the northeastern United States.
Both states draw from the Delaware River, which supplies water to about 13 million people across the region. Philadelphia's water comes from the Delaware and Schuylkill rivers. Northern New Jersey systems draw from reservoirs in the Highlands region. Southern New Jersey relies more on the Kirkwood-Cohansey aquifer, a shallow groundwater system vulnerable to surface contamination.
Lead infrastructure is Pennsylvania's most pressing water quality issue. The state has an estimated 270,000 lead service lines, according to EPA inventory data from 2024, concentrated in Philadelphia, Pittsburgh, and smaller industrial cities like Allentown and Scranton. Philadelphia alone has an estimated 60,000 lead service lines. New Jersey has fewer – roughly 180,000 – but passed legislation in 2021 requiring all lead service lines to be replaced within 10 years, the most aggressive timeline in the country.
Pennsylvania has no statewide lead service line replacement mandate, relying instead on the federal Lead and Copper Rule timeline. This means New Jersey residents will see lead pipes replaced faster, even though the starting inventory is smaller.
New Jersey, by a substantial margin. The state was a PFAS regulation pioneer, and its MCLs drove utility investment before federal rules existed. New Jersey also regulates 1,4-dioxane and has proposed standards for additional emerging contaminants. The state's mandatory lead service line replacement program is the most ambitious in the nation.
Pennsylvania adopted PFAS MCLs in 2023 – three years after New Jersey – and set them at higher levels (18 ppt vs 13-14 ppt). The state has not mandated lead service line replacement beyond what federal rules require. Pennsylvania's decentralized regulatory structure, with different agencies overseeing different aspects of water quality, creates gaps that New Jersey's more unified DEP avoids.
New Jersey has more contamination on paper but has done more to address it. The state's early action on PFAS limits forced utilities to install treatment systems years before federal deadlines. The mandatory lead service line replacement program is the most aggressive in the country. New Jersey spends more per capita on water quality than nearly any other state.
Pennsylvania has lower reported contamination rates but less regulatory protection. The state's small rural systems are particularly vulnerable – they often lack the funding for treatment upgrades and the technical capacity to monitor emerging contaminants. Philadelphia's lead service line problem remains largely unaddressed at the pace Pennsylvania is moving.
The verdict: New Jersey residents have better protections and more information about their water. Pennsylvania residents – especially those in older cities and small rural systems – face more unaddressed risk.
Check your water quality by zip code for your specific system's EPA test results. Bucks County, PA residents and those near NJ military installations should pay particular attention to PFAS data.
For homes with lead concerns, especially in Philadelphia and Pittsburgh, a reverse osmosis system like the AquaTru removes both lead and PFAS. The Brita Elite is a budget option for lead reduction. See our water filter guide for full comparisons.
For detailed analysis, get a water quality PDF report. State data: Pennsylvania page and New Jersey page.
Does New Jersey or Pennsylvania have better water quality? New Jersey has stricter regulations, earlier PFAS limits, and a mandatory lead service line replacement program. Pennsylvania has lower reported contamination but less regulatory oversight and more unaddressed lead infrastructure. New Jersey provides stronger protections overall.
How bad is PFAS contamination in New Jersey? About 56% of New Jersey water systems tested under UCMR5 detected PFAS. Over 150 public systems required treatment upgrades to meet the state's PFAS limits. Major contamination sources include military bases and the industrial corridor along the Passaic River.
Does Philadelphia have lead in its water? Philadelphia has an estimated 60,000 lead service lines, according to EPA inventory data. Lead leaches from these pipes into drinking water. Pennsylvania has no statewide mandate for lead service line replacement beyond the federal timeline, making point-of-use filters important for older homes.
What PFAS limits does New Jersey have? New Jersey set enforceable MCLs of 14 ppt for PFOA, 13 ppt for PFOS, and 13 ppt for PFNA in 2020. These were the first state-level PFAS limits in the country and are stricter than the EPA's federal MCL of 4 ppt for PFOA and PFOS individually.
Is Bucks County PA water contaminated with PFAS? Yes. The former Naval Air Station Willow Grove (now Horsham Air Guard Station) contaminated groundwater with PFAS across multiple Bucks County townships. Public water systems and private wells in the Warminster-Horsham-Warrington area have documented some of the highest PFAS levels in the northeastern US.