In the copper vs PEX question, NYC has already decided: PEX is not a listed material for water distribution under Table 605.4 of the 2022 NYC Plumbing Code, so repipes in the five boroughs are done in copper. PEX appears in NYC's Mechanical Code for heating and in New York State's code outside the city, which is why claims conflict.
NYC Repipe & Repair publishes these figures with named sources so every number can be checked before you call anyone, including us.
Most copper vs PEX articles weigh price, freeze resistance and installation speed, then recommend PEX. That comparison assumes a choice New York City plumbers don’t have. For the water you drink and shower in, the city’s code sets the material, and it isn’t plastic.
What the NYC Plumbing Code allows
Table 605.4 of the 2022 NYC Plumbing Code, chapter 6 lists the materials allowed for water distribution pipe:
| Material | Standard | Listed for NYC water distribution? |
|---|---|---|
| Copper tubing, Types K and L | ASTM B88 and others | Yes |
| Copper or copper-alloy pipe | ASTM B42, B302 | Yes |
| Brass pipe | ASTM B43 | Yes |
| Stainless steel 304/316 | ASTM A312, A778 | Yes |
| Ductile iron | AWWA C151 | Yes |
| PEX, PEX-AL-PEX, CPVC, PP-R | — | No |
| Galvanized steel, Type M copper | — | No |
The base model code that NYC adapted does list PEX and CPVC; New York City removed them. Joints are restricted too: PC 605.9 bans removable push-fit fittings of the SharkBite type, while permanent press-connect copper fittings made with a certified tool are allowed. Every fitting in contact with drinking water must meet NSF/ANSI 372 for lead content (PC 605.2).
Why you’ll read that PEX is allowed
The conflicting claims are real. Each one is true somewhere else:
- Heating, not plumbing. Hydronic heating is governed by the NYC Mechanical Code, and Table 1202.4 lists PEX tubing. A boiler installer running PEX to radiators is following that code. That’s the situation behind one NYC homeowner’s question about why a GC’s plumber was running everything in PEX.
- New York State, outside the city. The New York State Plumbing Code lists PEX for water distribution. Long Island and upstate articles describe that code, not NYC’s.
- Sprinklers. Uponor reports that NYC Council approved its residential PEX fire sprinkler systems. Sprinkler piping isn’t drinking water distribution.
- Plastic drains. PVC drain, waste and vent pipe is allowed in residential buildings of five stories or fewer (PC 701.9). “Plastic is allowed in small buildings” is true for drains, not supply.
- The manufacturer agrees. Uponor’s NYC page states that New York City “has yet to add PEX to its plumbing code.”
So when a forum poster says both the plumber and the electrician assured them PEX was fine in a private NYC two-family, the code text says otherwise for the water lines.
Copper vs PEX on cost
National guides put PEX at $0.40–$2 per foot and copper at $2–$8 (Bob Vila), and a copper repipe at 30–60% above PEX for the same house (ThePricer). That’s why national repipe averages look low next to NYC quotes. In the five boroughs the useful comparison is copper against copper: a house typically runs $12,000–$35,000 and an apartment $3,000–$8,000 (see how much repiping costs in NYC). Labor, at roughly 70% of the bill, matters more than the pipe. A quote that comes in far below those ranges and names PEX is quoting work that wouldn’t pass a DOB inspection. Run the repipe cost estimator for copper numbers on your own house.
What copper means for your repipe
- Type L for most interior work. Type K is the heavier wall used underground. The Type L vs Type K guide covers where each goes; Type M isn’t listed.
- Long service life. Habitat’s account of a Manhattan co-op repipe describes the new copper as lasting up to 80 years (Habitat). NYC’s soft, corrosive water can still cause pinhole leaks in copper, which is one reason wall thickness matters.
- No shortcuts on the joints. Soldered, brazed or permanent press only.
- No liners. Epoxy and CIPP lining are banned under PC 701.10; see pipe lining vs repiping.
The whole house repiping, apartment repiping and galvanized pipe replacement pages describe the copper work itself, and the repiping permit guide covers the DOB filing. The rule is the same in every borough, from Brooklyn brownstones to Queens two-families and post-1960 Staten Island houses, and it applies to a two-family house repipe exactly as it does to a co-op apartment.
Bottom line
For drinking water in New York City, the copper vs PEX debate ends at Table 605.4: copper, Type L or K, is what a permitted repipe uses. Compare quotes on copper type, joints, permit and restoration, not on plastic. Call (929) 659-6658 for a free on-site estimate with a written, itemized price.