Water & Wastewater Systems


The City of Grass Valley Public Works Department maintains the City’s water and sewer systems as well as the storm drain system. In addition to maintaining these systems, the City is responsible for disclosing information about the drinking water quality via an annual Consumer Confidence Report. 

Public Works also assists customers and contractors with the following applications:

Hydrant Flow Test Application

Temporary Hydrant Meter Use Application

Both of these applications, when complete, can be submitted to: info@cityofgrassvalley.com

Storm Water/Drainage

Drainage System Map

The City of Grass Valley is permitted by the California State Water Resources Control Board as a Traditional Permitee under the Phase II Small Municipal Separate Storm Sewer System (MS4) Program. More information about the Small MS4 Program and permitting requirements is available here: SWRCB

Water System

Water System Map

Water System Master Plan

Water Supply Contingency Plan

Mission Statement

To provide the highest quality water to residences and businesses in the City of Grass Valley in the most efficient manner possible. 


  • Achieve maximum efficiency in the production and distribution of potable water to our customers.
  • Continue the development of the cross-connection control program.
  • Cooperate and participate in the study of cooperative collaboration with NID.
  • Comply with all current Federal and State regulatory requirements and plan ahead for future regulations.
  • Evaluate and safeguard the City’s water supply against terrorism, vandalism and environmental contamination.
  • Protect the City’s investment by pro-actively maintaining the water distribution infrastructure.
  • Effectively reduce customer complaints.
  • Identify areas of undersized or restricted pipelines with the intent to replace.
  • Improve accountability of water produced/delivered.
  • Identify non-metered and unaccounted use of water.
  • Implement a Maintenance Management System to track inventory, activities and condition of the Water Distribution infrastructure.
  • Develop professionalism through training and certification of personnel.
  • Provide continuing education as required by the certification program.
  • Modify water treatment processes as necessary to eliminate toxic residuals at the City’s Wastewater Treatment Plant.
  • Public Works Document Central includes abundant resources including:
  • Consumer Confidence Report
  • Temporary Water Meter or  Hydrant Use Application      
  • Water Conservation Tips, Information and Resources
  • Backflow Brochure, Testers, Test Report and Cross-Connection Survey
  • Mandatory Water Conservation

Wastewater (Sewer) System 

Sewer System Map

FOG (Fats, Oils & Grease) Program 

All Food Service Establishments (FSE) and Waste Haulers doing business in the City of Grass Valley are required to have and maintain a Fats, Oils and Grease (FOG) removal system per City of Grass Valley Municipal Code Section 13.20.051

FSE’s and Waste Haulers are required to use the City’s FOG Control Program by emailing the following information to Catharine Dykes at catharined@cityofgrassvalley.com:  Name of Business, Address of Business, FOG Program Contact Name, Contact Mailing Address, Contact Phone Number.  

All FOG producers are subject to spot inspections of their grease interceptor systems by City of Grass Valley employees.  Businesses will not be notified prior to the inspections.  Should a business fail a FOG inspection, City staff will provide a date by which to have the FOG system serviced and will complete a re-inspection after that date.

Sewer System

Sewer Backflow Prevention Device

Sewer System Management Plan

Sewer Use Ordinance

Wastewater Master Plan

Wastewater Discharge

Wastewater Discharge Permit Application

Industrial Pretreatment Preliminary Survey

Industrial Pretreatment Preliminary Survey (Food Establishments)

Wastewater Treatment Plan Brochure

What does NOT go down the drain

Increased water to the system is not a good thing. Clean water contains no food or nutrients for the “bugs” that make the system work and too much flow can also wash the good “bugs” out of the system. Sources of this water can be:

  • Draining pools and spas
  • Yard drains
  • Roof drains
  • Broken or missing clean out covers

These sources of flow to the sewer are not good and create extra time and expense in the operation of the system and reduce efficiency and effluent quality. Other considerations that affect how well your system works include:

Do Not Put

  • Grease down the drain  
  • Pharmaceuticals (expired/unused pills can be turned in at the Police Department)
  • Herbicides (bug and lawn care products)
  • Oil based paints and solvents
  • Chlorine from pools and spas
  • Any toxic substance