Most Likely Causes (Ranked)
Modern American Standard faucets use ceramic disc cartridges similar to other major brands. Older models (pre-2000) may use traditional compression stems with rubber washers. The washer-type fails more frequently (every 2-5 years) but costs only $1-3 to fix. Ceramic cartridges last 5-10 years but cost $20-40 to replace.
American Standard compression faucets have a brass valve seat that the washer presses against. Hard water pits this surface over time. A new washer can't seal against a damaged seat, causing the drip to return within weeks of washer replacement.
The brass valve seat inside the American Standard faucet body develops pitting from hard water minerals. A new cartridge can't seal against a damaged seat, causing the drip to return shortly after cartridge replacement. This is more common in areas with hard water (white scale on fixtures).
Water pressure above 80 PSI forces water past seals in any faucet, including high-quality American Standard models. The drip may appear only at night or during low-usage hours when municipal pressure peaks. A pressure gauge on a hose bib will confirm.
The braided supply lines connecting the shut-off valves to the American Standard faucet tailpieces degrade over 5-8 years. The connection at the faucet tailpiece can loosen from vibration. Water appears under the sink, not from the faucet spout.
How to Fix It
Replace the American Standard Cartridge
$40-80 DIY / $150-250 Pro- 1Turn off both shut-off valves under the sink. Open the faucet to drain.
- 2Remove the handle: Allen key, adjustable wrench, stem wrench (for compression types).
- 3Compression type: remove handle, unscrew packing nut, pull stem, replace bottom washer ($1-3). Cartridge type: remove handle, remove retaining piece, pull cartridge, install new one.
- 4Test both hot and cold. If hot/cold are reversed, rotate the cartridge 180°.
- 5Pro tip: limited lifetime warranty on function and finish for most residential lines — call before buying parts.
Replace O-Rings
$5-15 DIY- 1Turn off water. Remove the spout by pulling straight up or removing the set screw at the base.
- 2Note the O-ring sizes — American Standard O-ring kit: varies by model — American Standard parts at 1-800-442-1902.
- 3Coat new O-rings with silicone plumber's grease before installing.
- 4Press the spout back into the body and test.
Tighten or Replace Supply Lines
$8-15- 1Check the supply line connections under the sink with a dry paper towel.
- 2Tighten loose connections a quarter turn. Don't overtighten.
- 3If the braided line is 5+ years old, replace it. Hand-tighten plus a quarter turn.
When to Call a Professional
American Standard cartridges are brand-specific — don't use universal replacements.
Don't force a stuck cartridge — you can crack the brass valve body. Use penetrating oil and patience.
If the faucet is 15+ years old and multiple parts are failing, replacing the entire faucet ($150-400) is more cost-effective.
American Standard has a wide range of faucet types spanning decades. Newer models use ceramic disc cartridges, while older models may use traditional compression valves with washers. Identifying the generation is key to the right repair approach.
How to Prevent It
Don't crank the handle — firm is enough. Overtightening destroys seals faster.
Clean the aerator every 6 months to prevent debris from reaching the cartridge.
Address drips immediately — a small drip indicates a seal that will only get worse.
Know your American Standard model number (tag on supply hose under sink) for ordering the right parts.
Frequently Asked Questions
Look for a model number on a tag attached to the supply hose under the sink. The American Standard logo is usually on the faucet body. You can also use American Standard's website to identify your model from a photo.
Repair if: it's under 10 years old and just needs a cartridge ($40-80). Replace if: it's 15+ years old, the valve body is corroded, or parts are discontinued.
5-10 years with normal use. Hard water, high pressure, and excessive handle force shorten cartridge life. Annual aerator cleaning prevents debris damage.
Yes — limited lifetime warranty on function and finish for most residential lines. Contact them before buying any parts.