The Wastewater Division of the Public Works Department administers and maintains sewage collection systems and treatment facilities for Nevada County Sanitation District Number 1.

There are 10 zones within the Sanitation District with facilities that collect and treat 1,245,000 gallons of wastewater each day. The Sanitation District provides sewer service to 5,230 accounts in western Nevada County with a population of 14,000.

Waste Water Pics (6)NEW: Nevada County Sanitation District No.1’s Proposed Sewer Rate Adjustments

For more information on Wastewater Rate Study and Fee Adjustment, please visit the NCSD Rates page.

For Sewer Emergencies or Odors Call:

(530) 265-1555

24 hours per day, 7 days per week

Wastewater Operations During PSPS Outages



                                         for the Communities of                                             Penn Valley, Lake Wildwood, Eden Ranch, Lake of the Pines, Darkhorse and Mountain Lake Estates

Operations of Equipment 

During power outages, sewer systems that operate on private residential pump tanks within the communities of Penn Valley, Lake Wildwood, Eden Ranch, Lake of the Pines and Dark Horse and Mountain Lake Estates, will not be functional.  All wastewater deposited into the tank will simply accumulate and have nowhere to go, potentially creating overflows and hazardous spills.

Water Conservation

It is imperative that during these extended power outages , residents conserve water usage as much as possible.  This includes flushing of toilets, wastewater from sinks, tubs and showers as well as laundry and dishwashers.

Use of generators

Pump tanks will not be operational until either power is restored or unless the system has been professionally added to a whole-house, back-up generator by a licensed electrical contractor.  It is highly discouraged that portable generators be used to operate pump tanks.


Once power is restored, be prepared for alarms to go off on systems.  It is not necessary to contact the Sanitation District regarding the alarm once the power has been restored unless it is in conjunction with a spill.  Field technicians will be making the rounds at that time and checking on systems throughout the District.

 Overflows & Spills

If an overflow or spill occurs, please immediately contact the Sanitation District at (530) 265-1555.

We ask that residents are patient during this event and once power is restored.  We greatly appreciate your cooperation.

New Sewer Connections

New Sewer Connections & Annual Charges

Find information about connecting to a District sewer system and to obtain the necessary forms and specifications.  Apply for a Sewer Permit (PDF).

Supplemental Zone packets
Dark Horse
Eden Ranch supplement
Mountain Lake Estates
Penn Valley/Valley Oak

Find yearly charges for one Equivalent Dwelling Unit (EDU) for connected properties in the respective zones of the District.
Districts and Zones

Districts & Zones

View Wastewater District Zones you can look up for additional information.
Sanitation District Codes

Sanitation District Codes

The Sanitation Code contains provisions related to sewers and sewerage systems and more.
Sewer System Management Plan

Sewer System Management Plan

View and download the Sanitary Sewer Management Plan (SSMP) requirements (PDF).