Sewer Services

Overview Sonplant

TUD strives for excellence in customer service. A dedicated staff provides a wide range of services including assisting our customers with all water and sewer service related issues, new service installations, new accounts and payment processing.

TUD’s sewer or wastewater system serves over 12,030 single family equivalent sewer connections and treats 1.2 million gallons of sewage daily at the Regional Plant located in Sonora. The District utilizes approximately 140 miles of pipeline to collect between 400-500 million gallons of sewage per year. For a detailed map of the TUD Sewer System, click here. (TUD Sewer Map). For TUD‘s Sanitary Management Plan (SSMP), click here and for TUD‘s Wastewater Ordinance information, Wastewater Ordinance – Amended, 9/27/2016.

Starting Your Service – It’s Easy!

If you have existing water/sewer service, just give one of our friendly customer service members a call at 532-5536 (Monday thru Friday, 7am to 4pm) and they will be glad to setup your account. If you do not have a water or sewer connection, you will need to complete a Water/Sewer Application and meet with our customer service engineer (located at the TUD office) to determine connection fees.


If your landowner is a TUD customer, you may have your water/sewer billing sent directly to you by completing a Tenant Water/Sewer Application. An $80.00 deposit for water service and $60.00 for sewer service is required. Your landowner will need to have an Owner Consent Form on file with TUD before we can accept your Tenant Water/Sewer Application.

Sewer-Relief Valves

Filtering Plant Photo courtesy of Bob Martinez

Why? Protect yourself, your home and your business by installing a sewer-relief valve. In recent years we have noticed a sharp increase in the number of sewage overflows into homes and businesses caused by roots, grease and general sewer pipeline deterioration. When a sewer blockage occurs in a private sewer pipeline or in a public sewer main, sewage backs up until it finds the lowest point to escape. That can be your shower, toilet or sink in your home or business.

Prevention: Damage resulting from sewage backing up into a home or business can easily be prevented by installing a Sewer-Relief Valve in the sewer pipeline serving your property. The Sewer-Relief Valve allows sewage to overflow outside your home or business instead of inside. The cost of having the Sewer-Relief Valve installed is small compared with the cost of cleaning up a sewage spill in your home or business.

Contact TUD: Sewer-Relief Valves are available free of charge, one per customer, at the TUD office. TUD staff can assist you (free of charge) in locating your sewer cleanout and if not found, can identify the location where one should be installed. How it works – click here.

Are You Having Sewer Problems?

Most TUD sewer customers don’t like to think about a possible sewage spill. But, they do happen. Sewage spills occur when the wastewater being transported via underground pipes overflows through a manhole, cleanout or broken pipe.

Common Causes of Sewer Spills

Grease: Grease builds up inside and eventually blocks sewer pipes. Grease gets into the sewer from household drains, as well as from poorly maintained commercial grease traps and interceptors. Grease is the most common cause of pipe blockages. How to prevent grease building up? Do not put grease down drains. Wipe down or scrape plates, pans, etc. into grease can. Once the grease and or can is cool, dispose of it in your garbage.

Structure problems: There can be many reasons for a sewer backup, many of them are caused by structure problems caused by tree roots in the lines, broken/cracked pipes, missing or broken cleanout caps, or undersized sewers can cause blockages.

How Can You Prevent Sewage Spills – FOG Program

Tuolumne Utilities District has recently adopted a Fats, Oils and Grease Control Program. Click the attached link to download this pdf document, FOG Program.

No Pan Grease

  1. Never put grease down garbage disposals, drains or toilets.
  2. Perform periodic cleaning to eliminate grease, debris and roots in your service laterals.
  3. Repair any structural problems in your sewer system and eliminate any rainwater infiltration/inflow leaks into your service laterals.

What If You Encounter a Sewer Spill?

If you see a sewage spill occurring, please call TUD immediately at 532-5536 and notify them of the problem. The TUD Wastewater staff will be notified seven days a week, 24 hours a day if an emergency occurs. We will respond as quickly as possible to get your issue resolved.

Sonora Panoramic