Is your toilet constantly running? Hearing that annoying hissing sound that never stops? The culprit is likely a worn-out fill valve. Before you call for professional help, you might be able to tackle this common plumbing repair yourself. DDB Plumbing has helped countless homeowners in West Richland and Pasco fix this exact issue, and we’re here to walk you through the process step by step.

A faulty fill valve doesn’t just create noise—it can waste hundreds of gallons of water monthly and significantly increase your utility bills. Whether you’re a DIY enthusiast or simply want to understand the process before hiring a professional, this guide will give you the confidence to handle this repair.

What Is a Toilet Fill Valve and Why Does It Fail?

The fill valve (also called a ballcock) is the mechanism inside your toilet tank that controls water flow after each flush. It automatically refills the tank to the proper level and shuts off when complete. Over time, mineral deposits, sediment buildup, and normal wear can cause the valve to malfunction, leading to continuous running water or weak flushes.

Most fill valves last 5-7 years, but hard water conditions common throughout Washington can shorten their lifespan. If you notice water constantly trickling into the bowl, weak flushing performance, or strange hissing sounds, it’s time for a replacement.

Tools and Materials You’ll Need

Before starting, gather these supplies:

• New fill valve kit (universal models fit most toilets)
• Adjustable wrench or pliers
• Bucket and towels
• Scissors (for cutting the refill tube)
• Sponge

Most hardware stores carry fill valve kits for $10-25. The entire project typically takes 30-45 minutes, even for beginners. However, if you’re uncomfortable working with plumbing fixtures, DDB Plumbing serves Kennewick, Richland, and surrounding areas with fast, professional toilet repair services.

9 Simple Steps to Replace Your Fill Valve

Step 1: Turn Off the Water Supply Locate the shut-off valve on the water supply line beneath your toilet (usually on the left side). Turn it clockwise until tight. Flush the toilet to drain the tank completely, then use a sponge to remove any remaining water.

Step 2: Disconnect the Water Supply Line Place your bucket beneath the connection point. Use your adjustable wrench to loosen the coupling nut connecting the supply line to the bottom of the tank. Some water will drain out—this is normal.

Step 3: Remove the Old Fill Valve Inside the tank, unclip the refill tube from the overflow pipe. Underneath the tank, locate the lock nut securing the fill valve. Turn it counterclockwise with pliers or your wrench to remove it. Lift the old fill valve straight out of the tank.

Step 4: Adjust Your New Fill Valve Height Most modern fill valves are adjustable. Follow the manufacturer’s instructions to set the correct height—the valve should stand at least one inch above the overflow pipe.

Step 5: Install the New Fill Valve Insert the new valve into the same opening where you removed the old one. From underneath the tank, thread the lock nut onto the valve shank and hand-tighten it. Then use your wrench to snug it firmly (but don’t overtighten, as this can crack the tank).

Step 6: Reconnect the Water Supply Line Attach the supply line to the bottom of the new fill valve. Hand-tighten the coupling nut, then give it a quarter-turn with your wrench. Over-tightening can damage the connection.

Step 7: Attach the Refill Tube Connect the small refill tube from the fill valve to the overflow pipe. You may need to trim the tube to the appropriate length with scissors. This tube is essential—it refills the toilet bowl after each flush.

Step 8: Turn On the Water and Test Slowly turn the shut-off valve counterclockwise to restore water flow. Watch as the tank fills and listen for the fill valve to shut off automatically when the water reaches the proper level. Check all connections for leaks.

Step 9: Adjust the Water Level Most fill valves have an adjustment mechanism (either a screw or a float adjustment) to set the proper water level. The water should stop about one inch below the overflow pipe. Flush several times to ensure everything works correctly.

When to Call a Professional Plumber

While replacing a fill valve is a manageable DIY project for many homeowners, some situations require professional expertise. If you encounter corroded parts, cracked tank porcelain, or multiple plumbing issues, it’s time to call the experts at DDB Plumbing.

We understand that plumbing emergencies don’t wait for convenient times. Our team provides emergency plumbing services throughout Washington, ensuring you’re never left dealing with overflowing toilets or water damage for long.

Contact DDB Plumbing for Expert Toilet Repair

Whether you need guidance on a DIY repair or prefer to have professionals handle the job, DDB Plumbing is here to help. Our experienced plumbers have successfully completed thousands of toilet repairs and replacements throughout the region.

Don’t let a running toilet waste water and inflate your utility bills. Contact DDB Plumbing today at 509-240-9278 or visit ddbplumbing.com to schedule your toilet repair service. Our certified plumbers respond immediately to any plumbing emergency, from simple fill valve replacements to complete toilet installations. Experience reliable, professional plumbing services from the team you can trust—serving West Richland, Pasco, Kennewick, Richland, and communities across Washington.