Excerpt from VWWM §1.3.6

A letter from a Water Purveyor declaring that the purveyor’s water system has the necessary water capacity available to supply the domestic and firefighting requirements for the project or service area identified in the letter. The Water Availability Letter must be signed by a member of the purveyor’s Board of Directors or General Manager and contain the following:

1. A map of the project or service area served by the water system showing parcels served along with their Assessor Parcel Numbers (APNs).
2. A description of the existing (or planned) system and all planned changes to the existing system that will be made to provide service to the project or service area identified in the letter.
3. A completed Waterworks Manual Compliance Worksheet (Appendix D) for the system and each pressure zone in the system.
4. The maximum day average demand (Q0), required domestic storage volume (V0) and number of service connections (N) may be calculated by using either the methods described in this manual or commonly accepted engineering practices.
5. A summary of all areas not in compliance with this manual and the plan for bringing the water system into compliance with this manual.
6. The engineering analysis prepared and stamped by a civil engineer which was used to prepare the Waterworks Manual Compliance Worksheet(s) and includes the following:
7. Method and calculations for determining maximum day average demand (Q0) and required domestic storage volume (V0), for both existing and maximum number of service connections (N).
8. Method and calculations for determining compliance with the peak hour demand requirements of this manual.
9. Method and calculations for determining compliance with the system reliability requirements of this manual.
10. Method and calculations for determining compliance with the emergency requirements in this manual.

In the case of Water Purveyors classified as Urban Water Suppliers under the Urban Water Management Planning Act, the adoption of a current Urban Water Management Plan that has been accepted by the State Department of Water Resources will satisfy the requirement for submission to and acceptance by the County of a Water Availability Letter (WAL).

More information on methods and procedures that can be used to prepare a WAL can be found in the Ventura County Waterworks Manual (VCWWM) 2nd Edition .The VCWWM establishes the minimum acceptable standards for the design and construction of additions or changes to existing water supply facilities in the unincorporated areas of Ventura County of Ventura and for the purpose of County or County-dependent special district approvals.

The Waterworks Manual Compliance Check sheet can be downloaded here.

In September 2014, notice was given to Ventura County Water Purveyors of the Water Availability Letter requirement and they have been given the opportunity to submit a WAL. A list of currently approved WALs or UWMP can be found on our Will Serve Letter Page. To obtain a copy of this notice please click here.

For list of Water Purveyors in Ventura County, Click here.

Water Purveyor Search: Here

List of Water Purveyors

A current list (as of 09/08/2015) of UWMP Approved Water Purveyors is listed below.

Approved Urban Water Supplier	Primary County Served
Antelope Valley – East Kern Water Agency	Kern
California Water Service Company Westlake	Ventura
California‐American Water Ventura District	Ventura
Calleguas Municipal Water District	Ventura
Camarillo, City of	Ventura
Camrosa Water District	Ventura
Casitas Municipal Water District	Ventura
Castaic Lake Water Agency – Santa Clarita Water Division	Los Angeles
Fillmore, City of	Ventura
Golden State Water Company Ojai	Ventura
Golden State Water Company Simi Valley	Ventura
Oxnard,City of	Ventura
Port Hueneme, City of	Ventura
Port Hueneme Water Agency	Ventura
San Buenaventura, City of	Ventura
Santa Paula, City of	Ventura
Thousand Oaks, City of	Ventura
Triunfo Sanitation District / Oak Park Water Service	Ventura
United Water Conservation District	Ventura
Ventura County Waterworks District No. 1 – Moorpark	Ventura
Ventura County Waterworks District No. 8 – Simi Valley	Ventura

 

 

Water Purveyors with Water Availability Letters accepted by Ventura County Public Works Agency:

(Current as of August 2, 2024)

 

Water Suppliers with Accepted WALs	Prepared By:
Beedy Street Well Water System*	Water Resource Engineering Associates
Crestview Mutual Water Company	Water Resource Engineering Associates
Channel Island Beach Community Service District	AECOM
Cloverdale Mutual Water Company*	Dreaming Tree Civil
Fuller Falls Mutual Water Company	Water Resource Engineering Associates
Garden Acres Mutual Water Company	Water Resource Engineering Associates
Meiners Oaks Water District	Water Resource Engineering Associates
Mutual Water Company of Vineyard Avenue Estates	Water Resource Engineering Associates
Pleasant Valley Mutual Water Company	Kennedy Jenks Consultants
Rincon Water and Road Works	Water Resource Engineering Associates
San Cayetano Mutual Water Company	YCE Incorporated
Santa Clara Resources Water System*	Water Resource Engineering Associates
Sisar Mutual Water Company	Water Resource Engineering Associates
Senior Canyon Mutual Water Company	Water Resource Engineering Associates
Solano Verde Mutual Water Company	Water Resource Engineering Associates
Strickland Mutual Water Company*	Water Resource Engineering Associates
Tobock Ranch Water District	Water Resource Engineering Associates
Ventura County Waterworks District No.17 – Bell Canyon	Ventura County Waterworks Districts
Ventura County Waterworks District No. 19 – Somis	Ventura County Waterworks Districts
Ventura County Water Works District No. 38 – Lake Sherwood	Ventura County Waterworks Districts
Ventura River Water District	Ventura River Water District
Vineyard Mutual Water Company	Water Resource Engineering Associates
Yerba Buena Water Company	Water Resource Engineering Associates
California American – Piru (Formerly Warring Water)	Jensen Design & Survey
El Campeon Ranch	Water Resource Engr. Assoc.
Del Norte Mutual Water Company	Jensen Design & Survey

* WAL accepted with conditions, contact PWA Land Development Services for Conditions of Acceptance. Will Serve Letters are not currently being accepted by these purveyors.

A Will-Serve Letter is an agreement/assurance between a Ventura County resident and the water purveyor to provide water service. A WSL approved by the Public Works Agency is required for a property owner to obtain a Building Permit from the Resource Management Agency.

WSLs will not be accepted by the Public Works Agency unless one of the following items are met:

• There is an accepted Water Availability Letter on file with the County of Ventura Public Works Agency Development & Inspection Services Division; or
• The Water Supplier has an approved Urban Water Management Plan(UWMP) with the State of California. A list of approved UWMP Water Suppliers can be found below.

If you meet either of the two requirements above then a WSL may be submitted to the PWA Development and Inspection Services counter for review. A review will include a verification of available connections and the water purveyors ability to provide service.

All will serve letters submitted shall include, at a minimum, the following information:

• Project size
• Description of Project, indicating if the project is existing or a new connection.
• An accounting of Will-Serve Letters issued compared to number of unused services remaining.
• New development or existing development
• APN
• Type of Development
• Date
• Letterhead from Retail Water Purveyor ( or Wholesale Water District if applicable)
• Signature from a representative of the purveyor having authority
• Address
• Allocations used and remaining
• Zone (if applicable)