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The objectives of the Urban Runoff Monitoring Program are the following:

  • Identify those receiving waters, which, without additional action to control pollution from urban runoff, cannot reasonably be expected to achieve or maintain applicable water quality standards required to sustain the beneficial uses, the goals, and the objectives of the Basin Plans for each respective watershed.
  • Identify significant water quality problems related to discharges of urban runoff within each permit area.
  • Analyze and interpret the collected data to determine the impact of urban runoff and/or validate applicable water quality models.
  • Characterize pollutants associated with urban runoff and assess the influence of urban land uses on receiving water quality and the beneficial uses of receiving waters.
  • Define water quality status, trends, and pollutants of concern associated with urban discharges and their impact on the beneficial uses of the receiving waters.
  • Identify other sources of pollutants in storm water runoff to the maximum extent practicable (MEP), including, but not limited to, atmospheric deposition, contaminated sediments, other non-point sources, etc.
  • Identify, prohibit, and control illicit connections and illegal discharges.
  • Evaluate the effectiveness of the following region-specific management plans, including an estimate of pollutant reductions achieved by the structural and nonstructural BMPs implemented by the Permittees:
    • Santa Ana Region - Drainage Area Management Plan (DAMP) and Water Quality Management Plans (WQMPs)
    • Santa Margarita Region – Individual Jurisdictional Runoff Management Plan (JRMP) and Water Quality Improvement Plan (WQIP)
    • Whitewater River Region – Storm Water Management Plan (SWMP) and Water Quality Management Plan (WQMP)
  • Conduct monitoring for pollutants known or expected to cause impairments to local water bodies. Regional monitoring efforts are conducted in cooperation with Permittee special interest groups (i.e., SAWPA and LESJWA), the Southern California Stormwater Monitoring Coalition, and with the County of San Bernardino.

Consolidated Monitoring Program

The Consolidated Monitoring Program (CMP) contains a description of monitoring methods for each type of monitoring conducted by the District on behalf of the Permittees.

For more information you may contact
Rebekah Guill at (951) 955-1200

The Consolidated Monitoring Program (CMP) was created to incorporate monitoring requirements for all applicable monitoring programs covered under the three separate NPDES permits. Three distinct watersheds are present within Riverside County: the Santa Margarita River Watershed, the Santa Ana River Watershed, and the Whitewater River Watershed. The areas of Riverside County under Permittee jurisdiction within each of the respective watersheds are known as the Santa Margarita Region (SMR), the Santa Ana Region (SAR), and the Whitewater River Region (WWR). Each watershed is governed by a separate Regional Water Quality Control Board (Water Board) and separate NPDES permits for which the District is listed as Principal (or Co-Principal) Permittee. The Riverside County Flood Control and Water Conservation District (District), as the Principal Permittee, administers the CMP on behalf of the Permittees named in the three NPDES permits in Riverside County.


The goal of the NPDES MS4 regulatory program is to manage the quality of urban runoff to prevent impacts to receiving waters within the Permittees’ respective jurisdictions. The original CMP was drafted in March 1994 and was accepted as part of the applications for MS4 permit renewal by the San Diego, Santa Ana, and the Colorado Water Boards in 1995. Subsequently, the Water Boards directed the Riverside County Permittees to implement the CMP in the “second round” MS4 permits. The CMP was updated in 2004 and 2008 to address the monitoring program objectives and the requirements of the third-round MS4 permits issued by the San Diego (2002), Santa Ana (2004) and Colorado (2008) Water Boards. The current CMP updates more effectively address the monitoring program objectives and the requirements of the fourth-round MS4 permits issued by the Santa Ana (2010) and the Colorado (2013) Regional Boards, as well as the fifth-round Regional Permit issued by the San Diego (2015) Regional Board. The CMP is intended to be a living document and will be updated as necessary to ensure its ongoing efficacy.

Structure and Contents of the CMP

The CMP is divided into six volumes: Table of Contents & the Introduction, the Quality Assurance Project Plan (QAPP), the SMR Monitoring Plan, the SAR Monitoring Plan, the WWR Monitoring Plan, and the Glossary of commonly used terms. The QAPP, located in Volume II, covers common elements of all three programs including general QA/QC, standard operating procedures, and general program information. The SMR Monitoring Plan*, and the SAR Monitoring Plan, the WWR Monitoring Plan, located in Volumes III through V, cover monitoring programs and information specific to the respective watershed. Volume VI includes a glossary of commonly used terms used throughout the CMP. Together, these six volumes are the CMP.

Prior to the issuance of the San Diego Regional Permit, Volume III was the sole basis for the SMR Monitoring Plan; however this Volume now refers to the Monitoring and Assessment Plan contained within the approved SMR Water Quality Improvement Plan (WQIP) as required by the permit. The SMR’s WQIP also makes reference to the QAPP (Volume II) as appropriate to maintain the linkage of the monitoring plan to appropriate monitoring protocols. Moving forward, the WQIP will be updated, if needed, to reflect changes or modifications to the SMR Monitoring and Assessment Plan.

In general contents of the CMP include guidance and methods for monitoring, including but not limited to:

  • Identification of Key Staff and Roles
  • Sampling and inspection procedures for the following monitoring activities:
    • Dry Weather Monitoring
    • Wet Weather Monitoring
    • Illicit Connections/Illegal Discharges
    • Field Measurements
    • Bioassessment/Stream Assessment
    • Toxicity Sampling
  • Monitoring Frequencies (program specific by region)
  • Monitoring Equipment and Supplies
  • Mobilization Criteria
  • Quality Assurance/Quality Control (QA/QC) procedures
  • Laboratory Analytical Methods including the method detection limits (MDLs) and Reporting Limits (RLs)
  • Data Collection and Analysis

Model Monitoring Program for Municipal Separate Storm Sewer Systems in Southern California (MMP).

The goal of the MS4 Urban Runoff Monitoring Program is to manage the quality of urban runoff to prevent impacts to receiving waters within the Permittees respective jurisdictions.

The District anticipates significant growth will occur within its Monitoring Program; thus, the CMP will continue to be updated, and progress will be reported in subsequent Monitoring Annual Reports.

Regional Monitoring Efforts

The Southern California Stormwater Monitoring Coalition (SMC) was formed in 2001 by cooperative agreement of the Phase I municipal stormwater NPDES lead permittees, the NPDES regulatory agencies in southern California and the Southern California Coastal Water Research Project. Each of the NPDES MS4 permits with Riverside County require some level of participation in the SMC’s regional monitoring efforts. Refer to the watershed-specific monitoring plans or the corresponding annual reports for more details. Also refer to the SMC webpage to learn more.

Southern California Stormwater Monitoring Coalition

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