Plumbing · Property Services

Greywater & Rainwater Harvesting Systems

Water-wise landscapes and drought rules have pushed many owners to reuse water from the washing machine, bathroom sinks and showers, or to capture the rain that falls on the roof. Done correctly, these systems cut water bills and keep gardens alive. NorTech connects you with vetted licensed plumbers who set their own price, design systems to code and handle permits.

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Greywater: what it is and what qualifies

Greywater is water from laundry, showers and bathroom sinks, not toilets or kitchen sinks. California allows several simple systems without a permit when conditions are met, and more complex ones with a permit. Laundry-to-landscape setups send washing machine water through valves to mulch basins around trees and plants. Plant-friendly soaps are important, and the water must not be stored for long or sprayed. A plumber confirms what is allowed and designs the connections. Share a rough sketch of your yard, the washing machine location and where the downspouts are, so the plumber can plan the simplest and cheapest layout.

Rainwater harvesting for the garden

Rain barrels and cisterns collect roof runoff for irrigation. A roof, gutters, a first-flush diverter and screens keep debris out, and an overflow sends excess water safely away from the foundation. Larger cisterns can feed drip irrigation by gravity or a pump. Rainwater should not be used for drinking unless the system is designed and treated for that. Ask about mosquito screens and winter care, and check local incentives that may help with the cost.

Maintenance, safety and landscape fit

Filters, screens and mulch basins need regular cleaning, and plants should be chosen to tolerate the water they receive. Keep greywater below the surface, away from vegetable roots you eat raw, and away from property lines and wells. The plumber will label pipes, provide a diagram and show you how to switch the system to sewer during rain or when using bleach. Good documentation helps the next owner and any inspector. Keep a simple diagram of valves and diverters in the laundry room, so anyone in the house knows how to switch the system between garden and sewer.

When to book greywater & rainwater harvesting systems

You want to cut outdoor water use and bills.
You are planting a drought-tolerant landscape.
Water restrictions make irrigation difficult.
You are building an ADU or remodel and want sustainable features.
A rebate program supports rain barrels or greywater.
You want to capture roof runoff for the garden.
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Backed by your provider’s warranty. If covered work fails, your provider makes it right — free.

Looking for a licensed plumber? Bigger jobs and anything that needs a permit go to a verified California C-36 contractor. See licensed plumber services.

Frequently asked

Greywater & Rainwater Harvesting Systems — common questions

Simple laundry-to-landscape systems may not, if they meet state conditions. More complex systems need a permit. Your plumber will explain what applies in your city.

Yes with plant-friendly soap and proper design. Avoid salt-heavy products and bleach, and keep the water below the surface rather than spraying it. Ask your plumber to recommend plant-friendly detergents.

No. Barrel water is intended for irrigation. Drinking water systems need treatment and are designed differently. Cisterns used for drinking need special design.

Use tight lids, fine screens on inlets and overflows and keep the system sealed. Do not leave open water standing. Ask about covers for every opening.

Many water agencies offer rebates for rain barrels, cisterns and greywater. Ask your plumber or your local water district. Check for rebate deadlines before you book.

The plumber guarantees installed plumbing and connections for 90 days. Barrels, pumps and filters carry manufacturer coverage, and plant outcomes depend on the landscape and care.

Didn’t find your answer? Nova, our AI assistant, is in the chat bubble in the bottom-right corner and can help anytime.

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