Santa Clara River Valley – Piru

Statistics

Basin Name

Basin Number

4-004.06

SGMA Basin Priority

High

Critically Overdrafted

Status

Subject to SGMA

DWR Region & POC

Southern Region Office
Eddie Pech
(818) 549-2324
Eduardo.Pech@water.ca.gov

Number of Wells

Hydrologic Region Name

South Coast Hydrologic Region

Counties

Ventura

Adjacent Basins

Santa Clara River Valley - Fillmore 4-004.05, Santa Clara River Valley - Santa Clara River Valley East 4-004.07,

At-A-Glance

Located in California’s South Coast hydrologic region, the Santa Clara River Valley – Piru is 8,889 acres in size. This High priority basin is home to an estimated 2,666 people (2010 value), which have been at a rate of 29.03. Santa Clara River Valley – Piru is a(n) basin with approximately 91 wells, of which approximately 4 are water supply wells. Groundwater accounts for approximately 91.48 percent of the basin’s water supply.

Source: CA DWR

2003: Bulletin 118 basin description

2014: Basin prioritization: high. Comment: GW quality impacts: nitrates, storm runoff, leaking tanks, etc. (B‐118). High Selenium and other inorganics, average TDS was 1450 mg/l (Ventura co 2011 annual GW report)

2018: Draft basin priority: high. Comments on groundwater level decline, salt intrusion subsidence –

CASGEM/WDL/GWIDS: Longterm hydrographs show groundwater level decline. Source: DWR 2) Groundwater level decline shown 2014-2015 Piru and Fillmore basins Biennial Groundwater Conditions Report, United Water Conservation District
Salt intrusion: 1) Water purveyors in the Piru, Fillmore, Santa Paula, Mound, and Oxnard subbasins include United Water Conservation District and Ventura County. United Water Conservation District operates surface water facilities to encourage groundwater protection through conjunctive use (UWCD 2012). Groundwater issues within the United Water Conservation District service area (which includes all of the basin) include overdraft conditions, sea water intrusion, and high nitrate concentrations. Source: Long Term Operation EIS, Chapter 7, U.S. Bureau of Reclamation (USBR)
Subsidence: Subsidence: Section 2.8 (2013); Figure 2.8 shows subsidence zones based on best available data (1973). Subsidence zones not updated due to lack of geodetic survey data. Source: Ventura County General Plan Hazards Appendix 2013

Comments on draft 2018 SGMA basin prioritization

Basin boundary modification request pending with Fillmore and Santa Paula subbasins