New York City is famous for high-quality tap water supplied by a vast protected watershed. But “NYC water is unfiltered” tells only part of the story. Most Catskill and Delaware water is subject to federal filtration avoidance; Croton water is conventionally filtered; and water quality at an individual faucet can also depend on the building's service line and plumbing.
Is New York City Tap Water Safe to Drink?
New York City's 2025 Drinking Water Supply and Quality Report, published in February 2026, reports that the city's drinking water met or exceeded applicable federal and state drinking-water standards during the reporting year.
DEP monitors water throughout the reservoir, aqueduct, treatment, and distribution systems. For most residents, NYC tap water is suitable for everyday drinking and cooking when there is no active advisory, and the building's plumbing is in good condition.
The important distinction is that the municipal supply can meet standards even if a particular building still has a plumbing-related issue. Lead, for example, is primarily a concern after water reaches privately owned service lines or internal plumbing—not in the protected upstate reservoir supply or city-owned water mains.
Where Does New York City Tap Water Come From?
New York City's water-supply system includes 19 reservoirs and three controlled lakes across three major systems: Croton, Catskill and Delaware. The watersheds cover almost 2,000 square miles, and water travels from sources more than 100 miles from the city.
Delaware
Four reservoirs. Historically provides about 50% of NYC's daily water needs under normal operating conditions.
Catskill
Two reservoirs. Historically supplies up to about 40% of daily demand.
Croton
Twelve reservoirs and three controlled lakes. Normally contributes about 10%, but can provide more when needed.
Those percentages are useful historical averages, not a promise of what comes from a particular faucet on a particular day. DEP can adjust distribution based on demand, reservoir conditions, maintenance, and infrastructure work.
NYC maintains a current water distribution map showing the systems that supply different parts of the city.
A Brief History of New York City's Water Supply
New Yorkers originally depended on local wells, springs and ponds. Population growth and pollution eventually made those sources inadequate, driving construction of one of the world's most extensive municipal water systems.
Croton
The original Croton Aqueduct began delivering water in 1842. Today the Croton watershed lies primarily in Westchester, Putnam and Dutchess counties.
Catskill
The Catskill system was built in the early twentieth century. Water from Ashokan Reservoir began reaching the city in 1917, and the broader Catskill system was completed in the 1920s. In May 2026, DEP marked the centennial of the completed Catskill supply system while announcing completion of a major modernization of Gilboa Dam.
Delaware
The Delaware system was developed later and historically supplies the largest share of daily demand. Its water reaches the city through the Delaware Aqueduct and interconnected tunnels and reservoirs.
Is New York City Water Really “Unfiltered”?
Most of it—but not all of it—is not conventionally filtered.
Catskill and Delaware water
The Catskill and Delaware supplies operate under a federal Filtration Avoidance Determination (FAD). Instead of relying on a conventional filtration plant, NYC protects these sources through watershed management, treatment and intensive monitoring while meeting filtration-avoidance requirements.
“Unfiltered” does not mean untreated. Catskill and Delaware water receives disinfection and other treatment before entering the distribution system.
Croton water
Croton water is treated at the Croton Water Filtration Plant beneath Van Cortlandt Park in the Bronx.
2026 update: NYC is already planning for the next filtration-waiver cycle. In April 2026, DEP announced that an independent scientific panel had reviewed its watershed-protection programs and concluded that continued avoidance of filtration for the Catskill/Delaware supply remains in the public interest, while also highlighting future challenges, including climate change and evolving regulations.
Why Can NYC Avoid Filtering Most of Its Water?
The core strategy is source-water protection: keep contaminants out of the Catskill and Delaware supplies before the water reaches the city.
- Watershed land acquisition and protection
- Wastewater-treatment upgrades
- Septic-system programs
- Agricultural runoff controls
- Stream restoration
- Forest management
- Extensive water-quality monitoring
- Watershed regulations
- Flood-resilience and community programs
DEP reports spending more than $100 million annually on watershed-protection programs.
How Is New York City Tap Water Treated?
Although most NYC source water is not conventionally filtered, it is treated. Depending on the source and operating conditions, treatment includes:
- Ultraviolet disinfection: Catskill/Delaware water passes through the city's UV facility.
- Chlorine: maintains microbial control through the distribution system.
- Fluoride: NYC targets about 0.7 mg/L to support dental-health policy.
- Orthophosphate: used for corrosion control and to reduce metal release from plumbing.
- pH adjustment: helps reduce corrosion.
- Croton filtration: Croton water receives conventional filtration plus treatment at the Croton Water Filtration Plant.
What Does the Latest NYC Water-Quality Report Say?
The latest annual report available as of August 2026 covers 2025 monitoring. It states that NYC drinking water met or exceeded applicable federal and state standards.
The report covers regulated contaminants, disinfectants and disinfection byproducts, lead and copper monitoring, PFAS, source-water monitoring and other water-quality parameters.
Disinfection byproducts
Chlorine can react with naturally occurring organic matter to form disinfection byproducts such as trihalomethanes (TTHMs) and haloacetic acids (HAA5). These compounds are regulated and routinely monitored. Detection by itself does not mean a standard has been exceeded.
Residents focused on chlorine taste, odor, or specific disinfection byproducts should compare filters using performance data for the exact substance of concern. See our Chlorine in Drinking Water Guide.
What About PFAS in New York City Tap Water?
PFAS deserve their own section because federal drinking-water requirements and testing have expanded rapidly.
NYC's 2025 report includes PFAS monitoring and notes that Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) sampling covered a broad panel of PFAS. In the city's annual 2025 sampling, PFOA was detected in one sample; the report states that PFOA was not detected in the quarterly UCMR 5 sampling. The report also notes one annual-sampling detection of PFHxA that was not detected in quarterly UCMR 5 sampling.
This is a more useful way to describe NYC PFAS than simply saying the water “contains PFAS” or is “PFAS-free.” PFAS monitoring involves very low concentrations, different compounds, and repeated sampling.
For background on federal PFAS rules, testing and filtration, see our PFAS in Drinking Water Guide.
Lead: The Household Issue NYC Residents Should Understand
NYC's protected source water and city-owned water mains deliver lead-free water. The principal drinking-water lead concern is private service lines and building plumbing.
Lead service lines were legal in New York City until 1961. DEP's December 2025 Lead Service Line Replacement Plan reported approximately 121,000 potential lead service lines and about 118,000 lines of unknown material, while the city continues inventory and replacement work.
Older buildings do not automatically mean contaminated water. NYC uses corrosion control, including orthophosphate and pH adjustment, to reduce lead release. But corrosion control cannot replace the value of identifying and ultimately replacing a lead service line.
Check your service line
Use the city's NYC Service Line Map. Because some records remain uncertain, an “unknown” result may require further investigation.
Request a free lead test kit
NYC residents can request a free residential lead test kit through 311 or DEP. Lead has no reliable color, odor, or taste, so testing is the appropriate way to evaluate a specific faucet.
Practical lead-reduction steps
- Use cold tap water for drinking and cooking.
- Flush water that has been standing in plumbing for several hours.
- Clean faucet aerators periodically.
- Do not use hot tap water to prepare infant formula or for cooking.
- If needed, choose a filter certified or appropriately tested for lead reduction and replace it on schedule.
- Replace lead-containing service lines and plumbing components when possible.
See our Lead in Drinking Water Guide for more detail.
Why Does NYC Tap Water Sometimes Look Cloudy or Taste Different?
Cloudy or milky water
Tiny air bubbles commonly make tap water look cloudy after pressure changes, main work, or temperature changes. Fill a clear glass and let it stand. If it clears from the bottom upward, entrained air is usually the explanation.
Contact 311 or your building manager if cloudiness persists or the water has unusual particles, color or odor.
Changes in taste
DEP notes that Catskill, Delaware and Croton water can taste different because their watersheds have different geology, soils and naturally occurring minerals. Distribution sources can also change with demand and system operations.
Chilling water in a covered glass pitcher can improve taste for some people. A suitable carbon filter may help when chlorine taste or odor is the concern.
What About Copepods in NYC Water?
Copepods are tiny naturally occurring aquatic crustaceans found in surface-water ecosystems. Their occasional presence in NYC water has generated considerable internet folklore, including the inaccurate claim that the city deliberately adds them to control mosquito larvae.
People with religious or personal concerns about microscopic organisms may choose an appropriate point-of-use screen or filtration method.
Do You Need a Water Filter in New York City?
Not automatically. NYC's municipal supply is extensively monitored and meets applicable drinking-water standards. Whether a household filter makes sense depends on what you want it to accomplish.
| Your concern | What to do first | What to look for in a filter |
|---|---|---|
| Lead | Check service-line records and consider a free NYC lead test. | Current lead-reduction certification/testing. |
| Chlorine taste or odor | Try chilling water first. | Chlorine taste/odor reduction performance. |
| Disinfection byproducts | Review NYC's annual report. | Testing for the specific DBP of concern. |
| PFAS | Review current PFAS monitoring. | PFAS certification/testing relevant to the compounds of concern. |
| Sediment/particles | Determine whether the source is building plumbing or utility work. | Appropriate particulate/sediment reduction. |
A TDS meter cannot tell you whether water contains lead, PFAS, chlorine, VOCs, or disinfection byproducts, and it should not be used as proof that a filter removes them.
Using a Berkey® Water Filter in New York City
Berkey systems are countertop gravity-fed filters that do not require electricity or an under-sink plumbing connection. That format can be convenient in apartments, rental properties, and kitchens where permanent installation is undesirable.
Filter performance depends on the specific element installed, so compare current testing with the contaminant you actually want to reduce.
Popular sizes for NYC homes
| System | Capacity | Practical fit |
|---|---|---|
| Travel Berkey® | 1.5 gal. | Individuals, couples and compact kitchens |
| Big Berkey® | 2.25 gal. | Small to medium households |
| Royal Berkey® | 3.25 gal. | Families and higher daily water use |
Filter-element options
Black Berkey® Elements are replacement elements for compatible systems. Review current contaminant-reduction documentation and rated capacity before purchasing.
Phoenix Gravity New Millennium Edition™ Elements provide another compatible option. The Travel Berkey®, Big Berkey®, and Royal Berkey® systems are certified to NSF/ANSI 42 and NSF/ANSI/CAN 372 when equipped with Phoenix elements.
Because NYC fluoridates its drinking water at approximately 0.7 mg/L, customers seeking to reduce fluoride can consider the Berkey Fluoride Filters PF-2, which are compatible with Black Berkey® Elements.
Compare the current choices on our Berkey Replacement Filters page.
Practical Checklist for NYC Residents
- Read the latest NYC Drinking Water Supply and Quality Report.
- Check the current DEP water-distribution map if your tap water suddenly tastes different.
- Check your property's service-line material.
- Request NYC's free lead test if the service line or plumbing is a concern.
- Use cold water for drinking and cooking.
- Follow official advisories after unusual pressure events or water-main problems.
- Call 311 for persistent changes in water color, particles, taste, or odor.
- Choose filtration according to a specific goal rather than a generic “better water” claim.
- Maintain and replace filter elements according to instructions.
Frequently Asked Questions About NYC Tap Water
Is New York City tap water filtered?
Most Catskill and Delaware water is not conventionally filtered because NYC operates under federal filtration avoidance. Croton water is filtered at the Croton Water Filtration Plant.
Is NYC's “unfiltered” water untreated?
No. Catskill and Delaware water receives treatment including ultraviolet disinfection, chlorine, corrosion control, pH adjustment, and fluoridation.
Does NYC tap water contain lead?
NYC's source water and city-owned mains are not the primary sources of lead. Lead can enter water from private lead service lines or building plumbing.
How can I test NYC tap water for lead?
NYC residents can request a free residential lead test kit through 311 or DEP.
Does NYC add fluoride to drinking water?
Yes. NYC adds fluoride to achieve a concentration of about 0.7 mg/L.
What did NYC's 2025 report say about PFAS?
The report includes extensive PFAS monitoring. PFOA was detected in one annual sample but was not detected in quarterly UCMR 5 sampling; PFHxA had a similar isolated annual detection and was not detected in quarterly UCMR 5 sampling.
Why does NYC tap water sometimes smell like chlorine?
Chlorine is used to maintain disinfection through the distribution system. Taste and odor can vary with temperature, source-water changes, and system operations.
Why does NYC water sometimes look cloudy?
Tiny air bubbles are a common cause. If a glass of water clears from the bottom upward after standing, entrained air is usually responsible.
Do I need a water filter in NYC?
Not necessarily. A filter is an optional household choice that depends on plumbing conditions, taste preferences, and the specific contaminants you want to reduce.
Can one filter remove every possible contaminant?
No. Performance varies by technology, filter element, contaminant, concentration, flow, water chemistry, and maintenance. Use current performance data for your specific concern.
Interesting Facts About New York City's Water System
- NYC's water supply includes 19 reservoirs and three controlled lakes.
- The combined watersheds cover almost 2,000 square miles.
- The system can store roughly 550 billion gallons.
- About 97% of the water reaches consumers by gravity rather than pumping.
- More than one billion gallons are delivered on a typical day.
- The system serves more than nine million people in NYC and communities north of the city.
- DEP spends more than $100 million annually on watershed protection.
- Croton water is filtered; most Catskill and Delaware water is not conventionally filtered.
- NYC banned new lead service lines in 1961.
- DEP is actively inventorying and planning replacement of remaining private lead service lines.
Final Thoughts
New York City's tap water deserves much of its strong reputation. The city protects a huge upstate watershed, treats and monitors its supply extensively, and reported compliance with applicable federal and state drinking-water standards in 2025.
But the most useful question is not simply, “Is NYC water good?” It is “What is happening between the reservoir and my faucet?” For many households—especially in older properties—the service line and building plumbing deserve as much attention as the municipal source water.
Start with NYC's official water-quality report and service-line information. Test for lead when appropriate. If you choose a home filter, select it according to the specific contaminant or taste issue you want to address and the performance evidence for the exact filter element.