Faucet Turned Off But Water Still Running: Shut Off First, Then Fix the Seal

If the handle is all the way off and water still drips or streams from the spout (or showerhead), the valve is not sealing. On most kitchen and bath faucets that means a worn cartridge, rubber seat and spring, compression washer, or related O-ring — not “mysterious pressure” that you fix by cranking the handle harder. Before you pull anything apart, shut the water off at the fixture stop or the house main. Manufacturer repair steps from Moen, Delta, and Kohler all start there for a reason.

I am not a licensed plumber. This guide is researched against those manufacturers’ shutoff and repair instructions plus EPA WaterSense leak guidance — not a numbered “guaranteed fix” list. This guide was substantially rewritten and re-fact-checked in August 2026.

Key takeaways

• Shut the water off first. Moen’s shutoff guide is blunt: any Moen faucet repair requires the supply off; skipping it risks flooding or injury. Close under-sink stops (or the main), then open the faucet to confirm flow is dead.
• Match the repair to the faucet type. Single-handle cartridge faucets need the right cartridge. Many Delta two-handle and ball-style valves use replaceable seats and springs (often kit RP4993). Older compression faucets use a flat rubber washer on the stem.
• EPA ties many faucet drips to worn washers and gaskets — and notes a one-drip-per-second leak can waste more than 3,000 gallons a year. Fixing the seal is both a water bill and a fixture-life issue.
• Identify hot vs cold on two-handle faucets by feeling which side of the spout runs warm when it drips, then service that side first (a practical check alongside Delta’s seats/springs repair path).
• Call a plumber for stuck or stripped shutoffs, valves behind sealed walls with no access, cracked valve bodies, or leaks that continue after OEM parts are installed correctly.

What “turned off but still running” usually means

Homeowners use that phrase for a few different symptoms. Sorting them keeps you from buying the wrong parts:

What you see	Likely meaning	First move
Steady drip from spout with handle fully closed	Seal inside the valve worn (cartridge, seat/spring, washer)	Shut off water; identify faucet type; replace the sealing parts
Slow stream that will not fully stop	Same seal failure, sometimes plus debris on the seat	Shut off; clean ports; replace seats/cartridge; flush valve
Water at handle base or under spout when faucet is off or on	Often O-rings or packing, not always the main shutoff seal	Still shut off before opening; inspect O-rings/packing after handle removal
Shower drips after tub/shower valve is off	Worn cartridge or seats in the shower valve	Shut off supplies; follow brand cartridge/seat steps (see also our Kohler shower valve guide)
Handle spins freely / never “bottoms out”	Stripped handle, stem, or worn stem/cartridge interface	Shut off; inspect handle/stem; replace damaged parts

This article focuses on the first two rows — the classic “handle off, spout still leaking” problem — because that is what the old “four reasons” framing tried (and failed) to cover with generic steps.

Step 0: Shut off the water (do this before any teardown)

Every serious OEM repair path starts here. Moen’s article How to Turn Off the Water Supply to the Faucet says shutoffs are usually under the sink, in a closet or access panel for a tub/shower, or — if those do not exist — at the home’s main shutoff near the meter (basement, garage, crawl space, or exterior wall). Rotate stops clockwise until they are firmly closed, then open the faucet/shower handle to confirm the water is completely off.

Delta’s seats-and-springs and two-handle drip instructions repeat the same rule: shut off the supply (or the whole house if you cannot find fixture stops), and cover the drain so small parts do not disappear. Kohler’s two-handle valve replacement guide likewise opens with “Turn off the water to your faucet…” before you remove the handle.

Practical notes while you are there:

• Do not force a frozen stop with a big wrench. Snapping an old under-sink valve is a fast way to turn a drip into a flood. Use the main shutoff instead and plan a plumber for the seized stop.
• Open the faucet after closing the stops to relieve pressure and prove the shutoff worked — Moen, Delta cartridge flush steps, and Kohler cartridge kits all assume that relief step.
• Have towels and a small bucket ready before you disconnect anything. A little residual water will still spill from lines and the spout.

Identify your faucet type before you buy parts

Buying “a washer” when you have a sealed cartridge, or a random cartridge when your Delta uses seats and springs, is how weekend projects turn into three hardware-store trips. Rough map:

Type	How it usually looks	What usually fails when it will not shut off
Cartridge (very common single-handle kitchen/bath; many showers)	One lever or knob; stem pulls out as a cartridge cylinder	Worn cartridge (and sometimes its O-rings)
Ball (classic single-handle Delta-style)	Rounded ball under the handle cam	Rubber seats and springs under the ball; sometimes the ball itself
Two-handle stem with seats/springs (many Delta lavs)	Separate hot and cold handles; stem lifts out after bonnet	Seats and springs in the valve body; then stems if drip remains
Compression (older two-handle)	Handles turn multiple rotations; stem screws down onto a seat	Flat rubber washer on the stem tip; sometimes a damaged metal seat
Ceramic disc	Quarter-turn handles; disc cartridge inside	Usually the disc cartridge assembly, not a lone washer

Best way to be sure: find the brand and model (tag on the supply line, underside of the sink deck, or old paperwork) and pull the parts diagram from the manufacturer. Moen’s solutions library, Delta’s parts finder, and Kohler Assist are built for that.

Diagnose which side is leaking (two-handle faucets)

On a two-handle sink, start by identifying which side is leaking. Delta’s RP4993 seats-and-springs guidance is written for spout drips with the handle off; a practical homeowner check is to feel whether the drip runs warm or cold and service that side first. Delta’s spout-drip overview also points two-handle owners toward seats/springs and stems rather than ignoring a steady drip. Shut off that side’s supply if you have separate stops. After you replace seats/springs (or the stem/washer), reassemble and test before tearing into the other side. If the drip persists, service the other valve the same way.

On a single-handle faucet there is only one cartridge or ball path, so you are replacing the sealing assembly as a unit rather than “hot vs cold.”

Fix path A: Replace seats and springs (common Delta drip)

If your faucet uses Delta-style seats and springs, a spout drip with the handle off is exactly what Delta’s RP4993 kit article is written to solve. The kit covers many single-handle ball faucets, two-handle stem faucets, and some cartridge tub/shower valves — but Delta also warns that variations exist, so check your parts diagram first.

Condensed from Delta’s published sequence (always after supply is off and the drain is covered):

1. Remove the handle (set screw with Allen wrench, or pry the index cap and remove the Phillips screw on knob styles).
2. Remove the adjusting ring if present (Delta says discard it on ball faucets), then the cap/bonnet.
3. Lift out the ball and cam (single-handle ball) or pull the stem straight up (two-handle stem).
4. Lift the old rubber seats and metal springs out of the ports. Wipe mineral deposits from the pockets with a soft damp cloth.
5. Install new springs large end first into the ports, then seats open/cup side down over the springs (Delta’s lav article: small end of spring into the seat; large end into the body).
6. Reinstall ball/cam or stem with the correct orientation tabs, hand-tighten the cap/bonnet, replace the handle.
7. Remove the aerator, open the faucet to a mixed position, restore supply, flush about a minute, check for leaks, then reinstall the aerator.

If the drip continues after both sides’ seats and springs are new, Delta’s next step is replacing the stem assemblies (they cite parts such as RP1740 / RP25513 depending on style) — not endless re-greasing of dead rubber.

Fix path B: Replace the cartridge (Moen, Kohler, and many single-handle valves)

Cartridge faucets seal inside a replaceable cylinder. When that cylinder wears, water bypasses even with the handle in the off position. Brand-specific details matter (retainer clips, bonnets, hot/cold orientation), but the safety frame is shared.

Moen example (1225 shower/standard valve cartridge). Moen’s 1225 cartridge article requires shutoff valves off before you remove stop tube, D-washer, and copper retaining clip. After the old cartridge is out, Moen recommends cleaning and flushing the valve body before the new cartridge goes in. Reinstall with tabs aligned to the 12 and 6 o’clock slots; if the copper clip will not seat, do not turn the water back on until the clip is correctly installed. Stem notch orientation sets hot/cold — rotate 180° if they are reversed after reassembly.

Kohler example (deck faucet valve cartridge). Kohler’s valve-kit sheet (113780-9) opens with: shut off the water supply, lift the handle to relieve pressure, then remove set screw, handle, cap, sphere, and bonnet before pulling the valve. New valve posts must line up with holes in the body before you reassemble and restore supply. For common two-handle lav valves (GP77005-RP / GP77006-RP), Kohler Assist walks the same shutoff-first path: remove handle, remove adapter if present, unthread the valve counterclockwise, install the new valve about 1/8–1/4 turn past hand tight, restore water and check for leaks before putting the handle back on.

Practical cartridge tips that prevent repeats:

• Bring the old cartridge (or clear photos of brand markings) to the store, or order the exact OEM part number. “Universal” cartridges often fit poorly and leak again.
• Use silicone-based plumber’s grease on O-rings where the maker allows it. Delta explicitly says not to use petroleum-based lubricants on O-rings.
• Flush debris before the new cartridge seals against grit. Moen and Delta both build a flush step into cartridge/seat service for this reason.

Fix path C: Compression washer and valve seat

Older multi-turn compression faucets still show up in baths and utility sinks. The stem screws a flat rubber washer down onto a metal seat. When the washer hardens, cracks, or is installed crooked, the faucet drips with the handle “off.” EPA WaterSense calls out old and worn faucet washers and gaskets as a frequent cause of faucet leaks, and adds the practical tip: turn off the water line before you start.

High-level repair after shutoff:

1. Remove the handle and packing nut / bonnet so you can unscrew the stem.
2. Remove the screw holding the washer on the stem tip; replace the washer with the same size and shape (take the old one with you).
3. Inspect the metal seat in the faucet body. If it is rough or pitted, a seat-dressing tool or a replaceable seat (where the design allows) may be needed — vinegar soaking alone will not reliably restore a scored seat, despite older internet advice.
4. Lightly grease threads as appropriate, reassemble, restore water, and test.

If the washer is new and the drip continues, the seat or stem is usually the next failure — not “needing more force” on the handle. Over-tightening a compression faucet to stop a drip is how people strip stems and crack handles.

O-rings: related, but not always the spout-drip cause

O-rings often get blamed first because they are cheap. They matter — especially for leaks around the spout hub or under the handle — but a spout that drips with the valve closed is more often the primary shutoff seal (cartridge face, seat/spring, or compression washer). When you already have the faucet open for a cartridge or stem job, inspect and replace cut or flattened O-rings and packings at the same time, using silicone grease where the manufacturer specifies it. Do not treat an O-ring swap as the whole diagnosis if water is clearly escaping past the closed valve into the spout.

Tools and parts checklist

• Adjustable wrench, Phillips and flat screwdrivers, Allen set
• Needle-nose pliers (retaining clips)
• Brand-correct cartridge, stem, or seats-and-springs kit
• Silicone plumber’s grease (not petroleum jelly on rubber seals)
• White vinegar and an old toothbrush for light mineral cleanup on accessible seats/ports
• Rags, bucket, drain cover or rag in the drain
• Optional: strap wrench for finish-sensitive bonnets; manufacturer cartridge puller for stubborn Moen-style cartridges

When to stop and call a plumber

• Shutoff valves will not turn, leak when operated, or look corroded through.
• The valve is behind tile or a sealed wall with no access panel, and you would need demolition to reach stops or the valve body.
• The brass valve body is cracked, or threads strip when you remove a bonnet or stem.
• You restored OEM seats/cartridge/washer correctly and the faucet still will not shut off — at that point you may need a new faucet or a buried shower valve replacement, not another aftermarket “universal” part.
• You are dealing with a continuous stream (not a drip) and cannot locate a working shutoff quickly — treat it as an emergency and close the house main.

EPA’s Fix a Leak guidance also notes that if step-by-step fixture repairs are not enough, it may be time to replace the fixture (WaterSense-labeled when you buy new) and consult a professional for installation help.

How this was researched

I cross-checked shutoff-first and seal-replacement steps against Moen Solutions (supply shutoff + 1225 cartridge), Delta support (RP4993 seats/springs and two-handle spout-drip procedure), Kohler Assist / Kohler valve-kit documentation, and EPA WaterSense Fix a Leak Week faucet guidance. Brand silence is respected where it applies: your exact model’s parts diagram wins over any generic blog sequence, including this one. No fabricated “I fixed four faucets last weekend” anecdotes — just the manufacturer order of operations a careful homeowner can follow.