Environment, Sustainability

Northern Neighbors Considering Rainwater Collection as a Potable Source


Close-up of a worn, metallic fountain pen nib on a black surface.Our neighbors to the North are considering rainwater collection as a potable source. Rainwater collection is just good practice for sustainability and conservation.

Last year, the American Rainwater Catchment Systems Association (ARCSA) was joined by the Canadian Association of Rainwater Management (CANARM) in a joint effort to promote rainwater collection throughout Canada.

In a recent article in the Nanaimo Bulletin, Julie Pisani, regional district director of drinking water, is embracing rainwater collection for potable usage with regional directors approving the use of rainwater as amiable source. The directors are hoping the resolution will ultimately be considered at the Union Municipalities Conference this September. Dr. Paul Hasselback, Medical Health Officer stated “If they have the appropriate treatment in place, it may be a viable solution”. The BC ARCSA representative is Ken Nentwig and can be reached at ken (dot) nentwig (at) gmail (dot) com

As British Columbia moves forward in their efforts to promote rainwater collection as a potable source, we encourage the District Directors to contact counties and cities in the Puget Sound Region. San Juan County has supported RWC for potable use for more than twenty years. In 2009, the Greater Seattle area adopted RWC for potable use as well as others in the region.

Rainwater Catchment

Greater Puget Sound Area Is Thirsty for Rainwater Collection


Modern office building with rooftop greenery and pool area.Thirsty for Rainwater Collection.

With more than 15 years’ designing and installing rainwater collection systems in and around Washington State, RainBank moved operations to the Seattle area four years ago to meet demand for Seattle and the Puget Sound region (and beyond… see Sea Scout Basephoto above).

Close-up of a worn, metallic fountain pen nib on a black surface.Experience and knowledge.

Seeing increased interest, we recognized the need for an experienced and knowledgeable designer and installer in the greater Puget Sound area.

Credentials Matter

Most counties in Washington State require an American Rainwater Catchment Systems Association Accredited (ARCSA) professional or Washington State licensed engineer with experience in water systems to design a potable rainwater catchment system. If the system requires pumping or filtration, a Washington State licensed plumber is required for installation of a rainwater collection system and is subject to permitting and inspections by the Department of Health. RainBank Rainwater Systems met this challenge long before it was required by the state legislature with ARCSA accreditation and in-house, licensed plumbers.

Steel Tanks

Close-up of a worn, metallic fountain pen nib on a black surface.

In the commercial market, there has been a need for competitive pricing for steel water tank sales and installation. After more than five years of commercial installations in the Seattle area, RainBank is filling that need as the Northwest Regional Dealer and certified installer of Pinnacle and Contain Water Tanks.

Rainwater collection is moving from niche to mainstream.

A full-service company offering design, consultation, cost analysis, permitting, construction, and component sales, RainBank’s experience and knowledge is unmatched in the industry.

RainBank is there for you to get the job done right the first time.

Infrastructure, Potable

Rainwater is a Safe Source of Drinking Water


Close-up of a worn, metallic fountain pen nib on a black surface.We know we can effectively capture, store, and use rainwater as a safe, viable source of potable water(drinking water) in Seattle and the Pacific Northwest.

A temperate climate offers rainfall throughout the year, including a little in most summers. With low intensity and high frequency rainfall, storage volume to use ratio is close to ideal. The autumn rain returns cisterns to high levels after summer usage and winter’s increased rainfall keeps them at optimal levels. As spring arrives, cistern levels continue to be supplied by less rainfall, but enough to allow summer demands to be met. The Pacific Northwest does not witness an extended “hard freeze” in the winter months as other parts of the country, allowing storage to be unaffected by most weather conditions. Marine winds help keep our air quality above average, with limited pollutants affecting quality. The same weather systems that produce snow caps for our municipal summer supplies also comes to us as rain in lower elevations, which can be stored for immediate and future use.

Storage is calculated by annual and monthly amounts, intensity, frequency, return period, and maximum number of dry days along with catchment area and surface runoff coefficients. Use or demands are based on number of occupants, fixtures, evaporation, efficiencies, indoor and outdoor requirements. Supply and demand equilibrium is compared to determine storage capacity, surplus/deficit, and level of storage. The frequency, return period and monthly amounts in Seattle and Puget Sound region can support whole house, year round use of rainwater collection.

An average 2,250 sq ft house in the Seattle area has the potential of collecting more than 53,000 gallons of water from its roof, rather than entering the storm system and accumulating contaminants before discharging in our waterways. Residential and commercial new construction is mandated to disperse roof runoff onsite, which is a good step toward protecting our waterways. But, why not use that water for our needs? Absorption type filtration, ultra violet light disinfection along with proper design, construction, and maintenance will allow homeowners to easily become their own purveyor of their own water source.

While most municipal water supplies are safe in the US, the recent water crises in Michigan and Ohio have brought public concern of quality and safety of our centralized water supplies. Costly repairs and replacement of an aging centralized water system will be required in the next 20 years. Rainwater collection is a viable, safe source of potable water for the homeowner in many counties in Washington State and elsewhere in the US and should be considered by those who don’t.

Rainwater collection helps protect our environment, conserves energy, decreases water contamination, helps prevent flooding, erosion and sewage releases into our waterways.

Tell your local government that you would like to see rainwater collection for single-family home potable use.

Rainwater Systems