Well & On-site Sewage Disposal Program

Sewage disposal and a safe, plentiful drinking water supply are often taken for granted. Yet the presence of contamination in drinking water, an insufficient water supply, or improperly disposed sewage can have a significant impact upon our health and quality of life. The well and septic system program goals are to protect surface and groundwater from contamination so that a safe, plentiful supply of drinking water can be obtained and maintained; and to assure that sewage can be, and is, disposed of in such a manner so as not to create a public health hazard, or pollute the environment.

        Well & Soil Boring Program
        Sewage Disposal Program
        Septic Operation and Maintenance Permit
        Graywater Systems



Well & Soil Boring Program


A permit is required for the installation, modification, or abandonment of water wells, test holes, cathodic protection wells, geothermal heat exchange wells, monitoring wells and soil borings pursuant to the California Well Standards (Bulletins 74-81 & 74-90) and Solano County Code - Chapter 13.10.

    Wells FAQ

Permit Application Forms:

Professional Resources:

Water Well Owner Resources:



Sewage Disposal Program


Assembly Bill 885, which was approved by the California State Assembly in September 2000, required the State Water Resources Control Board (SWRCB) to develop statewide standards for permitting and operation of Onsite Wastewater Treatment Systems, or septic systems. Effective May 1, 2013, the SWRCB adopted the Water Quality Control Policy for Siting, Design, Operation, and Maintenance of Onsite Wastewater Treatment Systems (OWTS) Policy. This policy established a statewide risk-based tiered approach for the regulation and management of septic systems. The policy required Solano County to prepare and submit documentation to obtain approval as Local Agency Management Program (LAMP). The California Regional Water Quality Control Board approved the Solano County LAMP on August 19, 2016 (Regional Board Resolution). The Solano County LAMP and supporting regulatory documents can be accessed by the following links below:

Permit Application Forms:

A permit is required for the installation, modification, repair, and abandonment of onsite sewage disposal systems including the replacement or destruction of a septic tank and replacement or repair of leach lines.

Professional Resources:

On-site sewage disposal systems shall be installed, repaired, or modified by a properly licensed contractor. Homeowners may also install their own sewage disposal systems provided they are familiar with pertinent County Code requirements. An alternative septic system may be required to address limiting site conditions (high water table, impervious soil, rock layer, etc.) and/or proper effluent treatment. Alternative sewage disposal systems are required to be designed by licensed Civil Engineer, Certified Engineering Geologist, or Registered Environmental Health Specialist.

Septic System Owner Resources:




Septic Operation and Maintenance Permit

Prior to final construction approval of an alternative septic system the property owner is required to obtain an operation and maintenance (O&M) permit.

Alternative On-Site Septic System Operation Permit Requirements

Permit Application & Reporting Forms:




Graywater Systems

Graywater is defined as untreated wastewater that has not been contaminated by any toilet discharge, has not been affected by infectious contaminated or unhealthy bodily wastes, and does not present a threat from contamination by unhealthful processing, manufacturing, or operating wastes. Graywater includes waste water from bathtubs, showers, bathroom washbasins, clothes washing machines, laundry tubs, but does not include wastewater from kitchen sinks, or dishwashers. A permit is required for the installation of simple and complex graywater systems. The regulations concerning graywater can be found at the following links below:

Permit Application Information:

Professional Resources:

These links are provided for information only and shall not be considered as endorsements or recommendations of Solano County.