Category Archives: Residential Rainwater Collection

El Nino Affects Snowpack and Water Supplies


Side-by-side satellite images showing green and dry landscapes.Forecastsindicate that the El Nino weather pattern is expected to continue bringing wetter, warmer forecasts for the winter, and continued dryer weather for next summer for the west coast. It is expected that we will see the same weather this next year as we did this year. Less snowpack in the Cascades will mean once again a limited amount of water formunicipal water supplies. A warmer and wetter winter will fillreservoirs, but Seattle’sexperience this year showed that without that snowpack to replenish stored levels, supplies fall short as summerstretches on. Many small waterdistricts in the Pacific Northwest found themselves runningextremely low, while Seattle Public Utilities is continuing to ask its customers to scale back usage.

There has been an increase in interest in rainwater collection for single-family residences in Seattle and other areas of WesternWashington this summer for potable and non-potable systems. Non-potable systems are being sought primarily for irrigation, but the real increase is in whole house potable demand. As our population in the Seattle area has increaseddramatically and drier conditions in the summer are causing higher demands, many arepreparing in advance for next summer.

A well-designed and installed rainwater catchment system can provide water to a single-familyhousehold year-round or supplement city water use during the summer. A non-potable system can ease the demand on city water by using collected rainwater for irrigation during those dry periods. Many of RainBank’s customers are commenting once again “that this is the right thing to do” – a messagethat I used to hear often before therecession. Folks want to do the right thing for the environment regardless of acrisis.

We must take population growth and protection of our natural resources seriously. Water is the one thing we cannot do without.

Singing in the Rain With Potable Water


Construction site with heavy machinery and dirt excavation near stairs.Potable water collection has Seattle residents singing in the rain.

It’s a tight fit in this backyard, but RainBank Rainwater Systems always anticipates and appreciates the opportunity to rise to a water collection challenge! A bonus is, given the drought conditions, that this Seattlecustomer will soon have drinking water, supplied by rain.

Under the watchful eye of RainBank’s staff, the first of two 5,000 gallon, potablewater tanks are put into place by Extreme Excavation.

The system will provide this Seattle residence with quality potable water for whole-house use and should be collecting water by end of next week.

RainBank Rainwater Systems continues providing its customers with top of the line installs in the Seattle area offering design built potable rainwater harvesting systems.

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When is Permitting Required for a Seattle Rainwater System?


When is permitting required for a rainwater collection system in Seattle?

Ripples spreading on water with reflections of tree branches above.According to Department of Ecology, State of Washington, collecting rainwater is nothing new. Humans have been doing so for thousands of years. Washington State Department of Ecology began allowing rainwater collection without a water rights permit in October 2009.

In January 2011, King County Department of Health adopted rainwater collection for potable use for detached single-family dwellings. The policy applies to systems intended to capture and store rainwater from surfaces for supply to plumbing fixtures. Systems that supply untreated rainwater to serve non-potable fixtures may be used for both residential and nonresidential occupancies. Systems that treat rainwater for potable use may be used only in detached single-family dwellings.

Rainwater systems are subject to plan review and applicable fees by the Department of Health and the Building Department. Harvested rainwater that is not treated to potable standards may only be used for water closets, urinals, hose bibs, industrial applications, domestic clothes washing, irrigation and water features.

Rainwater collection systems require a water use permit by King County Department of Heath. A non-pressurized stand-alone irrigation system does not require permitting. All pressurized systems do require review and permitting by King County Heath.

Systems for residential, potable use must be designed by a licensed engineer with experience in water systems design, an individual with a group B water systems designer licensed by King County Health, or an American Rainwater Catchment Systems Association (ARCSA) accreditation.