Drinking Water Protection Services

Published on . Last modified on March 2, 2017

Notice of Public Workshops: Download Flyer here!

These three public workshops are to discuss the process for adoption of the Point-of-Use/Point-of-Entry (POU/POE) Treatment Device Regulations, and to present the draft regulations.



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After a Flood 

Drought Information


Domestic Water Systems
The Drinking Water Protection Services (DWPS) regulates domestic water systems that serve 2-199 connections or systems that serve at least 25 people at least 60 days a year. DWPS is responsible for permitting, inspection and enforcement of over 1,250 water systems in the County.  DWPS provides assistance to non-State regulated public and private potable water distribution systems to comply with local, State and Federal regulations, and to resolve water quality and quantity issues; permits all water well construction, repair and destruction activities in the County; operates a cross-connection control program and a water reuse program; and permits and inspects desalination treatment facilities. DWPS also regulates all well construction in Monterey County.


Small Water System Program

Little girl drinking water from fountainThe small water system program includes Local and State Small Water Systems, which serve 2-14 connections. There are 969 systems, which serve about 4232 connections. Program staff regularly tests these water systems and provides guidance to correct any deficiencies.

The small water system program consists of the following two types of water systems:

  • Local Small Water System – Serves drinking water to 2-4 connections.
  • State Small Water System – Serves drinking water to 5-14 connections and does not regularly serve drinking water to more than an average of 25 individuals daily for more than 60 days out of the year.

For more information, please see State and Local.

Public Water System Program

Young girl washing her hands  CDCPublic water systems serve drinking water 15 or more service connections or regularly serves at least 25 individuals daily at least 60 days out of the year. Monterey County has a delegation agreement with the State Water Board to regulate public water systems that serve less than 200 connections. Systems with more than 200 connections are regulated by the State Water Board. The state website for public water systems is

Chemical water quality information for a public water system can be downloaded here.

Well Program

A permit is needed for all well construction, destruction, and repairs. Wells include domestic, irrigation, agriculture, monitoring, cathodic protection, and head exchange.

For more information, please see Wells

Source Capacity Testing Program

(includes water quality testing information for new single connection domestic wells)

All wells that are proposed to supply water for domestic use or to be connected to a water distribution system shall first undergo a continuous source-capacity (pumping) test to determine the yield of the well. If you wish to use this test for a water system, new home, or a planning project such as a subdivision, the test shall be witnessed by the Drinking Water Protection Services.

For more information, please see Source Capacity Testing.

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