regAssist Monitor — Parameters

Req ID	Category	Intent	Legal Status	Name	Subdomain(s)	Context	Conditions	Confidence
#Q001	administrative	unknown	mandatory	Public Comment Scope Restriction	other	Only comments regarding updates will be considered.	During Public Notice for Comments on the November 2025 Annual Update to the TMDL Compliance Plan	high
#Q002	operational	operational	recommended	Motorist Stormwater Pollution Prevention Practices	other	Caltrans' objective is to encourage motorists to practice the following correct behaviors to prevent storm water pollution and protect water quality: wipe off brake dust build-up on rims and wheels, keep vehicles clean to prevent residue from washing off, reduce fluid leaks with regular vehicle maintenance, properly dispose of trash and recycling, tarp and secure trash, vegetation and other loads, keep tires properly inflated to prevent wear, and avoid pesticides and fertilizers when rain is forecast.		high

Req ID	Category	Intent	Legal Status	Name	Subdomain(s)	Limit Type	Limit Value	Context	Conditions	Confidence
#R001	operational	operational	mandatory	Phase I MS4 Population Threshold	wastewater	requirement	>= 100000 people	Storm water permits are required for discharges from an MS4 serving a population of 100,000 or more.	Pursuant to the Federal Water Pollution Control Act (Clean Water Act) section 402(p)	high
#R002	operational	operational	mandatory	Phase II MS4 Population Threshold	wastewater	requirement	< 100000 people	The Municipal Storm Water Program manages the Phase II Permit Program (for municipalities less than 100,000).	Phase II Permit Program	high
#R003	physical	aesthetic	mandatory	Trash Discharge Prohibition	aquatic life, wastewater	requirement	0 trash	establish a prohibition on the discharge of trash	permitted storm water and other discharges	high
#R004	operational	operational	mandatory	Small MS4 Permit Expiration Date	wastewater	requirement	July 1, 2018 date	This Order expires on July 1, 2018.	If this Order is not reissued or replaced prior to the expiration date, it will be automatically continued in accordance with 40 CFR 122.6	high
#R005	operational	operational	mandatory	Phase I MS4 Population Threshold	wastewater	requirement	>= 100000 people	Clean Water Act section 402(p) require permits for MS4s serving a population of 100,000 or more.	Applies to Phase I Permit Program municipalities	high
#R006	operational	operational	mandatory	Phase II MS4 Population Threshold	wastewater	requirement	< 100000 people	The Phase II Permit Program manages municipalities with populations less than 100,000.	Applies to Phase II Permit Program municipalities	high
#R007	operational	operational	mandatory	Small MS4 Permit Expiration Date	wastewater	requirement	2018-07-01 date	Per Section J of the Small MS4 Permit, 'This Order expires on July 1, 2018.'	Remains in effect until reissued or replaced per 40 CFR 122.6	high
#R008	operational	operational	mandatory	Phase II Small MS4 General Permit Effective Date	wastewater	requirement	2013-07-01 date	The Phase II Small MS4 General Permit (Order 2013-0001-DWQ) requirements became effective on July 1, 2013.	Phase II permittees statewide	high
#R009	operational	reporting	mandatory	Annual Diversion Reporting Threshold	drinking water, agricultural water, other	requirement	> 10 acre-feet	Diverters who divert more than 10 acre-feet of water per year must measure diversions and submit data.	Based on the greater of historical use or face value	high
#R010	operational	reporting	mandatory	Record Retention Duration	other	requirement	10 years	Diverters must maintain records of the raw device output for at least 10 years.	Applies to raw output from measuring devices	high
#R011	operational	operational	mandatory	Large Diversion Flow Rate Threshold	other	requirement	> 30 cubic feet per second	Diverters with a direct diversion rate greater than 30 cfs are subject to Large Diversion Requirements.	Effective starting October 1, 2026	high
#R012	operational	operational	mandatory	Large Diversion Volume Threshold	other	requirement	> 10000 acre-feet	Diverters with an annual diversion amount greater than 10,000 acre-feet are subject to Large Diversion Requirements.	Effective starting October 1, 2026	high
#R013	design	operational	mandatory	Qualifying Reservoir Capacity Threshold	other	requirement	> 5000 acre-feet	Reservoirs with a capacity greater than 5,000 acre-feet must measure additional parameters like withdrawal and release rates.	Applicable for WY 2027 and beyond	high
#R014	operational	treatment	mandatory	High Volume Measurement Accuracy	other	requirement	± 10 %	Diversions of more than 200 acre-feet must be accurate to within 10 percent.	Applies for measurements starting in Water Year 2027	high
#R015	operational	treatment	mandatory	Low Volume Measurement Accuracy	other	requirement	± 15 %	Diversions between 11 and 200 acre-feet must be accurate to within 15 percent.	Applies for measurements starting in Water Year 2027	high
#R016	operational	reporting	mandatory	Large Diversion Submission Lag Time	other	requirement	<= 7 days	Weekly large diversion submissions must have a lag time of no more than 7 days between measurement and submission.	Beginning October 1, 2027	high
#R017	operational	reporting	mandatory	Measuring Device Registration Deadline	other	requirement	2027-01-31 date	Diverters must register measuring devices and submit a measurement methodology through CalWATRS by this date.		high
#R018	operational	operational	mandatory	Water Year 2027 Regulation Effective Date	other	requirement	2026-10-01 date	The updated measurement and data submission requirements are effective beginning Water Year 2027.		high
#R019	operational	operational	mandatory	Qualified Individual Diversion Threshold	other	requirement	200 acre-feet	For diversions more than 200 acre-feet per year, specific professional credentials (PE, licensed contractor, etc.) are required for the qualified individual.		high
#R020	operational	treatment	mandatory	High Volume Measurement Accuracy (WY 2027+)	other	requirement	± 10 %	Measurement accuracy for diversions greater than 200 acre-feet per year starting Water Year 2027.	Applies to both the 201-1,000 AF and > 1,000 AF thresholds	high
#R021	operational	treatment	mandatory	Low Volume Measurement Accuracy (WY 2027+)	other	requirement	± 15 %	Measurement accuracy for diversions between 11 and 200 acre-feet per year starting Water Year 2027.	Applies to both the 11-50 AF and 51-200 AF thresholds	high
#R022	operational	operational	mandatory	Legacy Device Accuracy Exemption	other	requirement	± 15 %	Measuring devices installed on or before January 1, 2016.	Installation date must be on or before January 1, 2016	high
#R023	operational	reporting	mandatory	Large Diversion Frequency (WY 2027+)	other	requirement	1,000 acre-feet	Hourly measurement frequency required for diversions above this threshold.	WY 2027 and beyond	high
#R024	operational	reporting	mandatory	Mid-Range Diversion Frequency (WY 2027+)	other	requirement	201-1,000 acre-feet	Daily measurement frequency required for diversions in this range.	WY 2027 and beyond	high
#R025	operational	reporting	mandatory	Small Diversion Frequency (WY 2027+)	other	requirement	51-200 acre-feet	Weekly measurement frequency required for diversions in this range.	WY 2027 and beyond	high
#R026	operational	reporting	mandatory	Minimum Measurement Threshold (WY 2027+)	other	requirement	11-50 acre-feet	Monthly measurement frequency required for the lowest tier of regulated diversions.	WY 2027 and beyond	high
#R027	operational	operational	mandatory	WY 2026 Measurement Accuracy Range	other	requirement	10 to 15 %	Measurements must be accurate to within ±10 to 15 percent, depending on the size of the water right.	Applicable for Water Year 2026	high
#R028	operational	reporting	mandatory	WY 2026 Direct Diversion Frequency (High Volume)	other	requirement	> 10000 acre-feet	Measurement frequency: Hourly, plus telemetry requirements	Based on face value or maximum annual historical use	high
#R029	operational	reporting	mandatory	WY 2026 Direct Diversion Frequency (Medium-High Volume)	other	requirement	1000 to 10000 acre-feet	Measurement frequency: Hourly	WY 2026 threshold	high
#R030	operational	reporting	mandatory	WY 2026 Direct Diversion Frequency (Medium Volume)	other	requirement	100 to 999 acre-feet	Measurement frequency: Daily	WY 2026 threshold	high
#R031	operational	reporting	mandatory	WY 2026 Direct Diversion Frequency (Low Volume)	other	requirement	10 to 99 acre-feet	Measurement frequency: Weekly	WY 2026 threshold	high
#R032	operational	reporting	mandatory	WY 2026 Storage Frequency (High Capacity)	other	requirement	>= 10000 acre-feet	Measurement frequency: Hourly, plus telemetry requirements	Based on storage capacity	high
#R033	operational	reporting	mandatory	WY 2026 Storage Frequency (Medium-High Capacity)	other	requirement	1000 to 9999 acre-feet	Measurement frequency: Hourly	WY 2026 threshold	high
#R034	operational	reporting	mandatory	WY 2026 Storage Frequency (Medium Capacity)	other	requirement	200 to 999 acre-feet	Measurement frequency: Daily	WY 2026 threshold	high
#R035	operational	reporting	mandatory	WY 2026 Storage Frequency (Low Capacity)	other	requirement	50 to 199 acre-feet	Measurement frequency: Weekly	WY 2026 threshold	high
#R036	operational	reporting	mandatory	WY 2026 Storage Frequency (Minimum Capacity)	other	requirement	10 to 49 acre-feet	Measurement frequency: Monthly	WY 2026 threshold	high
#R037	operational	operational	mandatory	Measurement Method Validity End Date	other	requirement	2026-09-30 date	Any measurement method on file with the Board may remain valid through this date.	Previous measurement methods on file	high
#R038	operational	operational	guidance	Large Diversion Compliance Extension Date	other	requirement	2027-10-01 date	Diverters that were not previously subject to telemetry requirements have until this date to begin meeting large diversion requirements.		high

Req ID	Name	Context	Confidence
#D001	WDRs	Waste Discharge Requirements	high
#D002	General Order	General WDRs order	high
#D003	Aggregate and Concrete Order	aggregate and/or concrete waste discharge requirements order	medium
#D004	TAC	Bulletin 74 Technical Advisory Committee	high
#D005	CCDEH	California Conference of Directors of Environmental Health	high
#D006	CGA	California Groundwater Association	high
#D007	GHEWs	geothermal heat exchange wells	high
#D008	SWRCB-DDW	State Water Resources Control Board-Division of Drinking Water	high
#D009	Public water supply wells	supply drinking water to 15 or more service connections	high
#D010	LEAs	Local Enforcing Agencies	high
#D011	DWR	Department of Water Resources	high
#D012	Stormwater injection wells	Drywells	high
#D013	Bulletin 74	California Well Standards	high
#D014	Thermal Plan	Water Quality Control Plan for Control of Temperature in the Coastal and Interstate Waters and Enclosed Bays and Estuaries of California	high
#D015	Clean Water Act	Section 316(a) of the Federal Water Pollution Control Act of 1972 and subsequent federal regulations	high
#D016	California Water Boards	State Water Resources Control Board and nine Regional Boards	high
#D017	SGMA	Sustainable Groundwater Management Act	high
#D018	GSAs	groundwater sustainability agencies	high
#D019	GSPs	groundwater sustainability plans	high
#D020	FSS	Facilitation Support Services	high
#D021	TSS	Technical Support Services	high
#D022	SGWP	Sustainable Groundwater Planning	high

Parameter Viewer

Q Qualitative Requirements (2)

P Quantitative Requirements (38)

D Definitions (22)