Water filter service in Lancaster, PA

What is in the water in Lancaster

Lancaster is served by City of Lancaster Bureau of Water .

Source water: Two rivers, in roughly a sixty forty split: about 60 percent of the supply comes from the Susquehanna River and about 40 percent from the Conestoga River. The city serves around 120,000 people through 49,000 connections, covering the city itself, nine surrounding municipalities and four bulk customers. A state source water assessment found both rivers potentially susceptible to agricultural activity, accidental road spills and urban runoff, while judging the overall risk of significant contamination to be low. Drawing from rivers in a heavily farmed county is the defining feature of this supply and it shapes both the treatment and what you might notice at the tap. Reported by City of Lancaster for 2025.

Lancaster upgraded from conventional treatment to membrane filtration in 2009 and 2010, and now uses ultrafiltration membranes at both plants. That matters for one specific reason: cryptosporidium has been detected in both source waters but has not been found in the finished water. Cryptosporidium is a chlorine-resistant parasite, so a physical barrier rather than a chemical one is what removes it, and membranes are that barrier. Seasonal taste and odour changes are a known feature here, driven by late winter snowmelt running into the Conestoga and by algae blooms from spring through autumn. Those are aesthetic, they come and go with the season, and a carbon filter at the drinking tap is the proportionate response.

These figures describe the distribution system. Your own tap can differ, and for lead it very likely does.

We do not yet hold a sourced figure for every field on this page. Where something is missing it is left blank rather than estimated, because an unsourced number here would look like information.

Buildings and plumbing in Lancaster

PFAS in Lancaster

Worth separating two things that get conflated on a membrane-filtered river supply like this one. Ultrafiltration membranes are extremely effective against particles and organisms, which is exactly why cryptosporidium is found in the source water here and not in the finished water. They are not the same technology as the reverse osmosis membranes that reject dissolved compounds such as PFAS, and a plant running one is not thereby treating for the other. So the presence of advanced filtration at Lancaster should not be read as a PFAS answer either way. The measured figures in the current city report are what decide whether point-of-use treatment is warranted at your tap, and in a county farmed this intensively the nitrate line in that same table is worth reading at the same time.

Source: Pennsylvania Department of Environmental Protection, 2025. More on confirming and treating this on our PFAS page.

What this means in practice

• Chlorine and chloramine taste. Confirm with free and total chlorine test strip, plus the utility report for the disinfectant type.
• PFAS. Confirm with certified laboratory analysis using an epa-approved pfas method.

Filters that apply here

• PFAS reduction systems. Reverse osmosis or a certified activated carbon system aimed at per- and polyfluoroalkyl substances.
• Under-sink carbon filters. A carbon block cartridge on the cold line under the sink.
• Reverse osmosis, tank. A membrane system under the sink that produces treated water to a dedicated tap and stores it in a small pressure tank.
• Whole-house filtration. A filter plumbed into the main line where water enters the building, so every tap, shower, and appliance downstream is fed treated water.
• Sediment filters. A mechanical filter that captures sand, silt, rust flakes, and other particles.

Installation in Lancaster

• Free water testing. Typically 45 to 60 minutes.
• Whole-house filter installation. Typically 3 to 5 hours.
• Under-sink reverse osmosis installation. Typically 2 to 4 hours.
• Repair, any brand. Typically 1 to 3 hours.

Renters, co-ops, and businesses

• Options for renters
• Co-ops and condos
• Offices and commercial sites

Local programmes

• Annual drinking water quality report. Lancaster publishes the full results table each year, including the nitrate figures that matter most on a supply drawing from two rivers in an intensively farmed county.

Nearby areas

• Reading, PA , Berks County
• Harrisburg, PA , Dauphin County
• Allentown, PA , Lehigh County

Sources

• City of Lancaster, 2025.
• Pennsylvania Department of Environmental Protection, 2025.
• Population: US Census Bureau sub-county population estimates, Vintage 2024 (POPESTIMATE2024).