Santa Clara River Valley – Piru

Statistics

Basin Notes

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

2019: Basin boundary modification approved. Per DWR: It “contains three components. The first part is a jurisdictional boundary modification to the Santa Paula and Filmore subbasins that shifts the existing shared boundary to align with the eastern extent of the adjudicated Santa Paula subbasin – this results in non-adjudicated areas being added to the Fillmore subbasin. The second part is a scientific boundary modification to the shared boundary of the Piru and Fillmore subbasins. Geologic maps and groundwater elevation data support the shared boundary location at a steep groundwater gradient inflection point. The third part of the request is a scientific modification to the external boundaries of the Filmore and Piru subbasins. The supporting information follows geologic contacts on a qualified geologic map to delineate the proposed boundary revisions. Four letters of support are associated with the request. Each part of the request meets regulatory requirements and supplies sufficient scientific rationale where needed.” Draft priority: high  

2022: January 26 – GSP submitted to DWR

2024: January 18 – GSP deemed incomplete by DWR

July 15 – Revised GSP submitted to DWR

July 18 – Public comment period opened by DWR until 9/16

At-A-Glance

Source: CA DWR
Source: CA DWR

California Water Library Documents About This Basin

Statement of Findings Regarding the Approval of the Santa Clara River Valley – Piru Subbasin 2024 Groundwater Sustainability Plan

California Department of Water Resources (DWR) | February 27th, 2025

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Piru Basin Groundwater Sustainability Plan Final (Revised)

Fillmore and Piru Basins Groundwater Sustainability Agency | July 8th, 2024

Due to size, this file has been divided. Part 1, Part 2, Part 3, Part 4, Part 5, Part 6, Part 7, Part 8, Part 9, Part 10, Part 11, Part 12, Part 13

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Establishing ecological thresholds and targets for groundwater management

Nature Portfolio (Springer Nature) | April 3rd, 2024

Groundwater is critical for many ecosystems, yet groundwater requirements for dependent ecosystems are rarely accounted for during water and conservation planning. Here w

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Statement of Findings regarding the Determination of Incomplete Status of the Santa Clara River Valley – Piru Subbasin Groundwater Sustainability Plan

California Department of Water Resources (DWR) | January 18th, 2024

The Department of Water Resources (Department) is required to evaluate whether a submitted groundwater sustainability plan (GSP or Plan) conforms to specific requirements

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Piru Basin Groundwater Sustainability Plan

Fillmore and Piru Basins Groundwater Sustainability Agency | December 16th, 2021

The Piru Basin (the Basin) is managed (along with the downslope Fillmore Basin) by the Fillmore and Piru Basins Groundwater Sustainability Agency (Agency). The Basin is p

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Status and Understanding of Groundwater Quality in the Santa Clara River Valley, 2007: California GAMA Priority Basin Project

U.S. Geological Survey (USGS) | September 26th, 2011

Groundwater quality in the approximately 460-square-mile Santa Clara River Valley study unit was investigated from April through June 2007 as part of the Priority Basin P

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Simulation of Ground-Water/Surface-Water Flow in the Santa Clara–Calleguas Ground-Water Basin, Ventura County, California

U.S. Geological Survey (USGS) | July 15th, 2003

Ground-water is the main source of water in the Santa Clara–Calleguas ground-water basin that covers about 310 square miles in Ventura County, California. A steady incr

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Bulletin No. 122, Ventura County and Upper Santa Clara River Drainage Area Land and Water Use Survey, 1961

California Department of Water Resources (DWR) | April 1st, 1965

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Water Supply Conditions in Southern California during 1958-1959, Volume II, Water Level Data, Central Coastal and Los Angeles Regions

California Department of Water Resources (DWR) | May 1st, 1961

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Bulletin No. 39-58, Water Supply Conditions in Southern California during 1957-1958, Volume II, Precipitation and Water Level Data, Central Coastal and Los Angeles Regions

California Department of Water Resources (DWR) | August 1st, 1960

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Bulletin No. 39-57, Water Supply Conditions in Southern California during 1956-1957, Volume II, Precipitation and Water Level Data Central Coastal and Los Angeles Regions

California Department of Water Resources (DWR) | June 16th, 1958

Bulletin No. 39-57 Volume I Bulletin No. 39-57 Volume III Bulletin No. 39-57 Volume IV

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GSA Information