Rainwater harvesting home

{{whyLabel}}: Regulations vary significantly; for example, Colorado limits residential collection to 110 gallons, while Texas offers tax exemptions for systems.

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• Check the National Conference of State Legislatures (NCSL) website for your state's specific statutes.
• Contact your local building department to ask about 'plumbing code' restrictions regarding non-potable water.
• Confirm if your Homeowners Association (HOA) has aesthetic guidelines for tanks.

{{doneWhenLabel}}: You have a written or confirmed understanding of your local volume limits and permit requirements.

{{whyLabel}}: Knowing how much water you can actually collect prevents buying an undersized or oversized tank.

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• Measure the footprint of your roof (length x width of the area draining into gutters).
• Use the formula: Square Footage x Rainfall (inches) x 0.623 = Total Gallons.
• Look up your local average monthly rainfall data for 2024/2025 to estimate seasonal yields.

{{doneWhenLabel}}: You have a calculated estimate of your monthly and annual collection potential in gallons.

{{whyLabel}}: Sizing the system depends on whether you are watering a small garden or flushing toilets.

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• Estimate garden needs: Most gardens require 0.5–1 inch of water per week.
• Calculate indoor non-potable use: A standard toilet uses 1.6 gallons per flush.
• Compare this demand against your catchment potential to find your 'ideal' storage capacity.

{{doneWhenLabel}}: You have a target storage volume (e.g., 500 gallons) based on actual usage needs.

{{whyLabel}}: A full 500-gallon tank weighs over 4,000 lbs; it needs a stable, level site close to downspouts.

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• Identify a spot that is higher than the area you want to irrigate (to use gravity).
• Ensure the site is away from septic drain fields and foundation footings.
• Check for easy access for maintenance and overflow drainage.

{{doneWhenLabel}}: A specific 5x5 ft (or appropriate size) area is marked on your property.

{{whyLabel}}: The material affects longevity and water quality (algae prevention).

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• Select UV-stabilized, food-grade polyethylene for a cost-effective, durable option.
• Choose a dark, opaque color (dark green or black) to block sunlight and prevent algae growth.
• Ensure the tank has a tight-fitting, screened manhole cover to keep out debris and mosquitoes.

{{doneWhenLabel}}: You have selected a specific tank model that meets your volume and UV requirements.

{{whyLabel}}: The first few gallons of rain wash bird droppings and dust off the roof; this 'first flush' must be diverted away from the tank.

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• Plan for a 12-inch vertical PVC pipe (diverter chamber) for every 100 sq ft of roof.
• Include a 'slow release' valve at the bottom to allow the chamber to empty between rains.
• Use a floating ball mechanism to seal the chamber once full, directing clean water to the tank.

{{doneWhenLabel}}: You have a sketch of the diverter assembly with specific pipe lengths.

{{whyLabel}}: The tank is the longest lead-time item and the core of the system.

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• Order a generic 'Vertical Liquid Storage Tank' from a local agricultural or industrial supplier.
• Confirm it includes a 2-inch outlet (bulkhead fitting) for the spigot.
• Arrange for delivery to the site if the tank is larger than 200 gallons.

{{doneWhenLabel}}: The tank is ordered or delivered to your property.

{{whyLabel}}: Uneven ground can cause the tank to tip or crack under the immense weight of the water.

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• Dig out 4–6 inches of topsoil in the marked area.
• Use a spirit level to ensure the subgrade is perfectly flat.
• Remove any sharp rocks or roots that could puncture a plastic tank base.

{{doneWhenLabel}}: A level, excavated pit is ready for the base material.

{{whyLabel}}: Gravel provides drainage and a stable non-shifting surface for the tank.

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• Fill the excavated area with 4 inches of 3/4-inch crushed stone or 'crusher run'.
• Compact the gravel using a hand tamper or plate compactor.
• Re-check levelness after compaction; add more material if low spots appear.

{{doneWhenLabel}}: A rock-solid, level gravel pad is completed.

{{whyLabel}}: Having all fittings on hand prevents multiple trips to the hardware store during installation.

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• Get Schedule 40 PVC pipes (3-inch or 4-inch depending on gutter size).
• Purchase stainless steel leaf screens (micro-mesh) for the gutters.
• Buy a high-quality brass ball valve for the tank outlet.

{{doneWhenLabel}}: All pipes, glue, and fittings are organized at the job site.

{{whyLabel}}: Pre-filtration at the gutter level prevents the first-flush and tank from clogging with large debris.

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• Clean existing gutters thoroughly.
• Install stainless steel micro-mesh guards over the entire gutter length.
• Ensure the guards are securely fastened to withstand heavy wind and rain.

{{doneWhenLabel}}: Gutters are clean and fully covered with mesh guards.

{{whyLabel}}: The outlet must be accessible for hoses but high enough to avoid drawing settled sediment.

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• Place the tank on the gravel pad.
• Install the bulkhead fitting 3–4 inches from the bottom of the tank.
• Thread the brass ball valve into the fitting using Teflon tape to prevent leaks.

{{doneWhenLabel}}: The tank is in place with a functional, leak-proof spigot.

{{whyLabel}}: This is the 'brain' of your water quality system.

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• Glue the PVC vertical chamber together according to your design.
• Mount it to the wall or a post near the tank using heavy-duty brackets.
• Connect the top of the diverter to the downspout using a 'T' junction.

{{doneWhenLabel}}: The diverter is securely mounted and connected to the downspout.

{{whyLabel}}: This final connection delivers the clean water to your storage.

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• Run a PVC pipe from the diverter's 'clean' outlet to the top of the tank.
• Use a 'tank screen' at the inlet to provide a final barrier against insects.
• Ensure the pipe has a slight downward slope (1/4 inch per foot) toward the tank.

{{doneWhenLabel}}: A continuous pipe path exists from the gutter to the tank interior.

{{whyLabel}}: When the tank is full, excess water must be directed away from your home's foundation.

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• Install a pipe at the very top of the tank that is equal to or larger than the inlet pipe.
• Direct the overflow at least 10 feet away from any structures.
• Screen the end of the overflow pipe to prevent rodents from entering.

{{doneWhenLabel}}: The overflow is installed and discharges to a safe drainage area.

{{whyLabel}}: Safety is paramount; no one should ever mistake rainwater for drinking water.

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• Apply 'CAUTION: NON-POTABLE WATER - DO NOT DRINK' stickers to the tank and all visible pipes.
• Use purple-colored tape or paint on the pipes, which is the international standard for reclaimed water.

{{doneWhenLabel}}: All components are clearly labeled for safety.

{{whyLabel}}: Catching leaks early prevents water damage and waste.

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• Pour a bucket of water into the gutter to check the flow through the diverter.
• Observe the first-flush chamber filling and the ball sealing correctly.
• Check all PVC joints for drips during the next actual rain event.

{{doneWhenLabel}}: The system has successfully processed water without leaks.

{{whyLabel}}: Rainwater systems are 'low maintenance' but not 'no maintenance'.

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• Clean gutter screens once a month (more often in autumn).
• Empty the first-flush sediment trap after every major storm.
• Inspect the tank interior for sludge buildup once a year.

{{doneWhenLabel}}: A maintenance log or digital reminder is set up.

{{whyLabel}}: Freezing water expands and can shatter PVC pipes and plastic tanks.

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• If you live in a freezing climate, drain the tank completely before the first frost.
• Disconnect the downspout from the tank and redirect it to the ground.
• Leave the tank valve open to prevent any condensation from freezing inside.

{{doneWhenLabel}}: The system is safely decommissioned for the winter season.