General inspection and maintenance guidelines for stormwater harvest and use systems General inspection and maintenance guidelines for stormwater harvest and use systems

General inspection and maintenance guidelines for stormwater harvest and use systems
Link to this table

Component	Timeframe	What to look for during Inspection	Maintenance 1
Source Area/Collection Surface	Annually	Changes in land use or land disturbance	Implement source control BMPs as needed to help meet pre-storage water quality targets
		Pollution hot spots
		Damage to roofing materials	Repair as needed
		Overhanging branches	Trim overhanging branches
		Nests or other evidence of animal activity	Remove nests and implement additional measures to discourage animal activity
	Monthly or as needed	General condition of pavement	Adjust street sweeping schedule as needed to maintain clean pavement
Collection System	Spring startup and fall	General condition of gutters, downspouts, and conveyances	Clean accumulated debris in fall prior to winter operations or seasonal shut-down, and as needed.
		Debris clogging inlets, gutters, downspouts, and other conveyances
		Evidence of leaks at junctions or along conveyances
	After large storms	General condition of first flush and high-flow diverters (bypass system)	Repair as needed
		Soil erosion or flooding along diversion flow pathways	Provide appropriate erosion control measures (rip rap, check dams, etc.)
Storage System	Spring start up	General condition of all storage system components	Clean, repair and replace as needed
		Position and function of valves	Test per manufacturer’s guidelines
		Function of operational structures and controls
	Periodically following startup	Tank ventilation	Clean, repair and replace as needed
		Excess soil moisture near tanks or other evidence of leaks	Repair leaks per manufacturer’s guidance
		Growth of algae or microbes	Drain and clean tank per manufacturer’s guidelines
		Intrusion of mosquitos or small animals	Implement appropriate pest control as needed
	Monthly	Sediment level in tank or pond	Remove sediment when the tank sediment storage volume has reached 50% of capacity
Treatment Systems	Spring startup	General condition and function of all treatment system components	Conduct testing per manufacturer’s guidance Clean and repair as needed
	Twice per year	Clogging from accumulated dirt and debris in pre-storage treatment components	Clean as needed
		Evidence of leaks from loose fittings, joints	Repair as needed
	3 times per year AND after each rain event that exceeds the design capacity of the collection system	Clogging of intake and filters in first flush diverters, especially during pollen season (filter clogging)	lean and replace as needed
	Monthly or as required	Performance of water treatment system	Test water quality at point of use and at other points in the system (outlet of collection system, in-tank) as required
			Adjust treatment parameters to meet any water quality deficiencies
	Per manufacturer specifications and as needed	Condition of replaceable components in the treatment systems (filters, cartridges, bulbs, etc.)	Replace/repair per manufacture’s guidelines and as needed. Typical UV treatment is annual and filters are started on a quarterly basis or when differential pressure drops.
Distribution System	Spring startup and fall	General condition of all distribution system components	Repair/replace as needed
		Position and function of valves	Test per manufacturer's guidelines
		Function of operational controls
		Presence of leaks (test)
		Function and performance of pump	Complete all startup inspection and operations per manufacturer’s guidelines
	Monthly	Presence of biofilms or sediment accumulation on filters	Replace/disinfect as needed
	Per manufacturer and as needed	Function of pumps and other control equipment	Test all control components per manufacturer's guidelines or as needed to diagnose problems in the system
Overflow/Bypass Systems	Annual (above-ground)/ As needed (below-ground)	Clogging or damage at overflow/bypass intakes	Clean and repair as needed
		Erosion of downstream receiving area	Stabilize erosion, repair overflow system as needed, check for failures in other upstream components
		Proper pump control and operation	Repair and replace as needed

¹See also decommissioning and winter maintenance tasks