Tag Archives: potable

Rainwater Catchment, Residential Rainwater Collection

Collecting Drinking Water in Seattle

fountain-752450_640We receive many requests from Seattle and King County residents about whether they can collect water for drinking, and if so, how does the process work?

Here are some of our favorite blog posts about collecting drinking water in Seattle:

CAN I COLLECT DRINKING WATER FROM MY ROOF IN SEATTLE?

You can have a potable rainwater collection system designed by an engineer, licensed in the state of Washington with experience in RWC, or an ARCSA (American Rainwater Catchment Systems Association) accredited professional. READ MORE

WHEN IS PERMITTING REQUIRED FOR A SEATTLE RAINWATER SYSTEM?
In January 2011, King County Department of Health adopted rainwater collection for potable use for detached single-family dwellings. READ MORE

WHAT IS SEATTLE’S POSITION ON RAINWATER COLLECTION?
In October 2009 Washington State revised its water rights laws to allow rainwater collection. King County (Seattle) has adopted rainwater collection for potable use in single-family dwellings, as well. READ MORE

When all is said and done, once you’ve decided to add rainwater collection to your new or existing dwelling, it’s important that you work with an accredited professional with the knowledge and resources to design and build a system that will meet your water needs for many years.

Environment, Sustainability

Northern Neighbors Considering Rainwater Collection as a Potable Source

Tank with treeOur 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.

Infrastructure, Potable

Rainwater is a Safe Source of Drinking Water

gutter-pipe-54531_640We 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.