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Document ID us-ca-mustpr-2018-05-15 Title Municipal Stormwater Program URL https://www.waterboards.ca.gov/water_issues/programs/stormwater/municipal.html Jurisdiction /us/ca Subdomain(s) none Language Status completed Analyzed at 2026-05-12 05:05:04.790099+00:00 Relevance inventory_targeted_fetch

Q Qualitative Requirements (19)

Req ID Category Intent Legal Status Name Subdomain(s) Context Conditions Confidence
#Q001administrativeunknownmandatoryMS4 Storm Water Permit Requirementwastewater, otherPursuant to the Federal Water Pollution Control Act (Clean Water Act) section 402(p), storm water permits are required for discharges from an MS4 serving a population of 100,000 or more.For discharges from an MS4 serving a population of 100,000 or morehigh
#Q002operationaloperationalmandatoryContinuation of Expired Small MS4 Permit Conditionswastewater, otherTherefore, all permit conditions and requirements will have to continue to be implemented until a new permit is adopted.If the Small MS4 Permit (Order) is not reissued or replaced prior to its expiration datehigh
#Q003administrativereportingmandatoryAuthorization Renewal for Expired Order Activitieswastewater, otherIf you wish to continue an activity regulated by this Order after the expiration date of this Order, you must apply for and obtain authorization as required by the new permit once it is issued.When wishing to continue a regulated activity after the expiration date of the Orderhigh
#Q004reportingreportingmandatoryNotice of Intent Submission for New Permitwastewater, otherTherefore, once the new permit is adopted by the State Water Board, applicants will be required to submit a Notice of Intent, including all information required by the new permit, at that time.Once the new permit is adopted by the State Water Boardhigh
#Q005operationaloperationalmandatoryPhase I Storm Water Management Plan Developmentwastewater, otherPhase I MS4 permits require the discharger to develop and implement a Storm Water Management Plan/Program with the goal of reducing the discharge of pollutants to the maximum extent practicable.Under Phase I MS4 permitshigh
#Q006reportingreportingguidanceReport a Storm Water Permit Non-Filerwastewater, otherReport a Non-Filer - Let us know if a business does not have a Storm Water Permit.If a business does not have a Storm Water Permitmedium
#Q007reportingreportingmandatoryWell Completion Report Submissiondrinking water, otherWell drillers must submit well completion reports to DWR within 60 days.Upon completion of well construction, modification, or destructionhigh
#Q008administrativeoperationalmandatoryLocal Well Ordinance Stringencydrinking water, otherCities, counties, or water districts adopt a Local Well Ordinance for their jurisdiction that is at least as stringent as Bulletin 74 standards.When adopting local well ordinanceshigh
#Q009administrativeoperationalmandatoryModel Well Ordinance Enforcementdrinking water, otherIf a local well ordinance is not adopted, then the LEA must enforce the Model Well Ordinance.In jurisdictions where a local well ordinance has not been adoptedhigh
#Q010operationalhealthmandatoryPublic Supply Well Certificationdrinking waterWells supplying Public Supply Systems must comply with additional requirements for certification by the State Water Resources Control Board – Division of Drinking Water (DDW).For wells supplying Public Supply Systemshigh
#Q011administrativeoperationalrecommendedPublic Supply Well Consultation Advisorydrinking waterTherefore, consultation with DDW prior to public supply well construction is advised.Prior to public supply well constructionhigh
#Q012administrativeoperationalmandatoryLEA Enforcement Responsibilitydrinking water, otherLocal Enforcing Agencies (LEAs) such as local governments, counties, cities, and some water districts are responsible for enforcing standards that are either equal to or more stringent than our well standards.Within their respective jurisdictionshigh
#Q013reportingreportingmandatoryDWR Minimum Standard Recommendations Reportingdrinking water, otherThe department shall report to the appropriate California regional water quality control board its recommendations for minimum standards of well construction in any particular locality in which it deems regulation necessary to protection of quality of underground waterIn any particular locality where regulation is deemed necessary for groundwater protectionhigh
#Q014reportingreportingmandatoryDWR Abandoned Well Sealing Recommendations Reportingdrinking water, otherand shall report to the Legislature from time to time, its recommendations for proper sealing of abandoned wells.From time to timehigh
#Q015designoperationalmandatoryDWR Geothermal Heat Exchange Well Standards DevelopmentotherIn 1996, the Legislature added Water Code Section 13800.5, requiring DWR to develop standards for geothermal heat exchange wells (GHEWs).high
#Q016administrativeoperationalmandatoryDWR Statewide Standards Development and Submissiondrinking water, otherDWR develops recommended minimum statewide standards for water wells, monitoring wells, cathodic protection wells, and geothermal heat exchange wells, published as Bulletin 74, California Well Standards, and submits them to the State Water Resources Control Board.Step 1 of the summarized implementation processhigh
#Q017administrativeoperationalmandatoryGSA Formation RequirementotherSGMA requires local agencies to form groundwater sustainability agencies (GSAs) for the high and medium priority basins.For high and medium priority basinshigh
#Q018operationaloperationalmandatoryGSP Development and ImplementationotherGSAs develop and implement groundwater sustainability plans (GSPs) to avoid undesirable results and mitigate overdraft within 20 years.To avoid undesirable results and mitigate overdrafthigh
#Q019reportingreportingmandatoryRequired Information SubmissionotherThe SGMA Portal allows local agencies, GSAs, and watermasters to submit, modify, and view the information required by SGMA.high

P Quantitative Requirements (27)

Req ID Category Intent Legal Status Name Subdomain(s) Limit Type Limit Value Context Conditions Confidence
#R001operationalreportingmandatoryGeneral Diversion Reporting Thresholdagricultural water, otherrequirement> 10 acre-feet per yearAnnual diversions exceeding this threshold must be measured and reportedApplies to single rights, combined rights sharing a point of diversion, or storage capacityhigh
#R002operationaloperationalmandatoryMeasurement Accuracy Requirementotherrequirement±10 to 15 %General accuracy requirement for measurement devicesDepends on size of water righthigh
#R003operationaloperationalmandatoryQualified Individual Thresholdotherrequirement> 200 acre-feet per yearProfessional requirements for individuals certifying measurementsDiversions above this level require CA registered professional engineer or licensed contractorhigh
#R004operationaloperationalmandatoryWY 2027+ Hourly Measurement Thresholdotherrequirement> 1000 acre-feetDiversions exceeding this threshold require hourly measurement frequencyAccuracy must be within ± 10%high
#R005operationalreportingmandatoryLarge Diversion Volume Threshold (WY 2027+)otherrequirement> 10000 acre-feet per yearThreshold for Large Diversion Requirements replacing previous telemetry rulesApplies starting October 1, 2026high
#R006operationalreportingmandatoryLarge Diversion Rate Threshold (WY 2027+)otherrequirement> 30 cubic feet per secondFlow rate threshold for Large Diversion RequirementsMaximum allowable direct diversion ratehigh
#R007designreportingmandatoryQualifying Reservoir Capacityotherrequirement> 5000 acre-feetReservoirs exceeding this capacity must measure additional parametersMust measure withdrawn volume/rate and release volume/ratehigh
#R008operationalreportingmandatoryRecords Retention Durationotherrequirement10 yearsRetention period for raw device output recordsApplicable for data collected under the 2027+ ruleshigh
#R009operationaloperationalmandatoryWY 2027+ Daily Measurement Frequency Thresholdotherrequirement201 to 1000 acre-feetVolume threshold requiring daily measurement frequencyEffective for Water Year 2027 and beyondhigh
#R010operationaloperationalmandatoryWY 2027+ Weekly Measurement Frequency Thresholdotherrequirement51 to 200 acre-feetVolume threshold requiring weekly measurement frequencyEffective for Water Year 2027 and beyondhigh
#R011operationaloperationalmandatoryWY 2027+ Monthly Measurement Frequency Thresholdotherrequirement11 to 50 acre-feetVolume threshold requiring monthly measurement frequencyEffective for Water Year 2027 and beyondhigh
#R012operationaloperationalmandatoryLegacy Measuring Device Accuracyotherrequirement 15 %Accuracy requirement for devices installed on or before a specific dateApplies to measuring devices installed on or before January 1, 2016high
#R013operationalreportingmandatoryLarge Diversion Submission Lag Timeotherrequirement<= 7 daysMaximum allowed time between measurement and data submission for large diversionsApplies to weekly submissions beginning October 1, 2026high
#R014operationalreportingmandatoryWY 2026 Direct Diversion Daily Thresholdotherrequirement100 to 999 acre-feetMeasurement frequency requirement for direct diversions in Water Year 2026Based on greater of face value or max annual historical usehigh
#R015operationalreportingmandatoryWY 2026 Direct Diversion Weekly Thresholdotherrequirement10 to 99 acre-feetMeasurement frequency requirement for direct diversions in Water Year 2026Based on greater of face value or max annual historical usehigh
#R016operationalreportingmandatoryWY 2026 Storage Daily Thresholdotherrequirement200 to 999 acre-feetMeasurement frequency requirement for diversions to storage in Water Year 2026Based on the capacity of the storage facilityhigh
#R017operationalreportingmandatoryWY 2026 Storage Weekly Thresholdotherrequirement50 to 199 acre-feetMeasurement frequency requirement for diversions to storage in Water Year 2026Based on the capacity of the storage facilityhigh
#R018operationalreportingmandatoryWY 2026 Storage Monthly Thresholdotherrequirement10 to 49 acre-feetMeasurement frequency requirement for diversions to storage in Water Year 2026Based on the capacity of the storage facilityhigh
#R019operationalreportingmandatoryWY 2026 Telemetry Requirement Thresholdotherrequirement> 10000 acre-feetThreshold for requiring telemetry in Water Year 2026Applies to direct diversions (combined face value) or storage capacityhigh
#R020operationaloperationalmandatoryWY 2026 Direct Diversion Hourly Frequencyotherrequirement1000 to 10000 acre-feetMeasurement frequency for direct diversions in Water Year 2026 based on greater of face value or historical useApplies through September 30, 2026high
#R021operationaloperationalmandatoryWY 2026 Diversion to Storage Hourly Frequencyotherrequirement1000 to 9999 acre-feetMeasurement frequency for diversions to storage in Water Year 2026 based on storage capacityApplies through September 30, 2026high
#R022operationalreportingmandatoryWY 2027+ Measurement Exemptionotherrequirement<= 10 acre-feetThreshold below which no measurement is required for Water Year 2027 and beyondBased on volume threshold definitions in updated regulationhigh
#R023operationaloperationalmandatoryWY 2027+ Daily Accuracy Requirement Correctionotherrequirement± 10 %Volume threshold (201 to 1,000 acre-feet) accuracy requirement for WY 2027+Corrects missing symbol in existing record R009high
#R024operationaloperationalmandatoryWY 2027+ Weekly Accuracy Requirement Correctionotherrequirement± 15 %Volume threshold (51 to 200 acre-feet) accuracy requirement for WY 2027+Corrects missing symbol in existing record R010high
#R025operationaloperationalmandatoryWY 2027+ Monthly Accuracy Requirement Correctionotherrequirement± 15 %Volume threshold (11 to 50 acre-feet) accuracy requirement for WY 2027+Corrects missing symbol in existing record R011high
#R026operationaloperationalmandatoryLegacy Measuring Device Accuracy Correctionotherrequirement± 15 %Requirement for devices installed on or before January 1, 2016Corrects missing symbol in existing record R012high
#R027operationalreportingmandatoryWY 2026 Storage Telemetry and Hourly Thresholdotherrequirement>= 10000 acre-feetSpecific trigger for telemetry and hourly measurement for storage facilitiesBased on capacity of the storage facility for WY 2026high

D Definitions (31)

Req ID Category Name Context Confidence
#D001SGMASustainable Groundwater Management Acthigh
#D002GSAsgroundwater sustainability agencieshigh
#D003GSPsgroundwater sustainability planshigh
#D004FSSFacilitation Support Serviceshigh
#D005TSSTechnical Support Serviceshigh
#D006SGWPSustainable Groundwater Planninghigh
#D007MS4a conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains) owned or operated by a Statehigh
#D008Clean Water ActFederal Water Pollution Control Acthigh
#D009Water BoardsThe State Water Resources Control Board (State Water Board) and Regional Water Quality Control Boardshigh
#D010Trash AmendmentsAmendment to the Water Quality Control Plan for Ocean Waters of California (Ocean Plan) to Control Trash and Part 1 Trash Provisions of the Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of Californiahigh
#D011Ocean PlanWater Quality Control Plan for Ocean Waters of Californiahigh
#D012OALCalifornia Office of Administrative Lawhigh
#D013U.S. EPAU.S. Environmental Protection Agencyhigh
#D014ASBSArea of Special Biological Significancehigh
#D015QISPQualified Industrial Storm Water Practitionerhigh
#D016SMARTSStormwater Multiple Application and Report Tracking Systemhigh
#D017CROMERRCross-Media Electronic Reporting Rulehigh
#D018NPDESNational Pollutant Discharge Elimination Systemhigh
#D019California Water Boardsthe State Water Resources Control Board and nine Regional Boardshigh
#D020State Water BoardState Water Resources Control Boardhigh
#D021CalEPACalifornia Environmental Protection Agencyhigh
#D022TMDLA Total Maximum Daily Load (TMDL) is a science-based estimate of how much of a specific pollutant a waterbody can receive without harming its intended uses (called beneficial uses) — such as recreation, wildlife habitat, or drinking water supply. It serves as a planning tool to guide efforts to restore water quality by identifying both natural and human-caused sources of pollution.high
#D023Beneficial usesintended uses [of a waterbody] — such as recreation, wildlife habitat, or drinking water supply.high
#D024Basin Planthe region’s official water quality planhigh
#D025Advance Restoration Plan (ARP)a more efficient way to addressing water pollution... It works well when the problem appears to be related to better implementation of existing permits or when pollution is not the sole or main cause of the water quality problem. An ARP includes: A clear schedule, Specific milestones, Targeted actions to reduce pollution.high
#D026Impairedrivers, lakes, and coastal waters in the San Diego Region [that] don’t meet water quality standardshigh
#D027Surface Water Ambient Monitoring Program (SWAMP)a program run by the State Water Board that collects and shares scientific data about rivers, lakes, and streams.high
#D028Integrated Reporta report every two years on the condition of California’s surface waters — including rivers, streams, reservoirs, estuaries, lagoons, bays, and ocean waters... It includes information about impaired waters and high-quality waters.high
#D029USEPAU.S. Environmental Protection Agencyhigh
#D030SWRCBState Water Resources Control Boardhigh
#D031TMDL investigationThe process of assigning allowable limits to controllable sources—such as stormwater discharges or wastewater treatment plants—so that the total pollution load stays within safe limits.high