Tag Archives: Water treatment

Kingston wastewater could be valuable for watering golf course

Kingston’s sewage treatment plant could provide irrigation water for the nearby White Horse Golf Course and possibly other uses under a plan now in development.

Kingston Sewage Treatment Plant Photo courtesy of Golder Associates
Kingston Sewage Treatment Plant
Photo courtesy of Golder and Associates via ©Sky-Pix Aerial Photography, www.sky-pix.com/

Kitsap County commissioners recently signed a $325,000 “predesign” contract with Brown and Caldwell engineers. The firm was hired to answer a host of questions about the feasibility of producing high-quality effluent at the plant and then putting the clean water to good use.

“We’re just starting to look at the whole project,” said Barbara Zaroff of Kitsap County’s Wastewater Division. “We just had our kickoff meeting two weeks ago, and now Brown and Caldwell will be going out to collect data.”

I peppered Barbara with questions that she could not answer at this point, because the detail work is yet to be done. But we know from a previous study by Golder Associates (PDF 18.2 mb) that producing high-quality effluent in Kingston is more than a random thought.

Golder found benefits from using the water for supplementing flows in nearby Grover’s Creek while recharging much-needed groundwater in that area of the county. The Suquamish Tribe, which owns White Horse Golf Course, has expressed interest in acquiring the water if various issues can be resolved.

The Kingston treatment plant, completed in 2005, produces an average of 150,000 gallons of effluent per day, currently discharged into Appletree Cove. As population grows, the plant can be expanded to about 300,000 gallons per day.

It appears it would be cost-effective to treat the water to tertiary standards with sand filters, although other technologies will be explored. A pond could be built on or near the golf course, which would store the water for irrigation and allow infiltration into the ground. The available water should provide the needs of the course with plenty of water left over.

Discharging into a wetland that feeds into Grover’s Creek is another idea, along with providing irrigation at the county’s North Kitsap Heritage Park. Unused water might still be discharged into Puget Sound, particularly in winter months when irrigation water is not needed.

One question that always arises with reclaimed water is what happens to trace amounts of chemicals that pass through the treatment process, such as pharmaceutical drugs that mimic hormones. We know from studies that some of these chemicals can affect the growth, development and metabolism of fish in some situations.

An analysis by Golder Associates (PDF 18.2 mb) concluded that future treatment processes in the Kingston plant would remove between 80 and 97 percent of endocrine disrupting compounds coming into the plant. Environmental conditions where reclaimed water is discharged would degrade the chemicals further, so the overall risk would be low for salmon and other fish, according to the report.

The new study is expected to look further into the risks. Meanwhile, the state Department of Ecology is continuing to work on a new reclaimed-water rule that could improve permitting and monitoring by producers of reclaimed water.

The Kingston project would be similar to what is happening at the Central Kitsap Wastewater Treatment Plant near Brownsville, where construction is adding sand filters as part of an overall upgrade to the plant.

Work continues at the Central Kitsap Wastewater Treatment Plant File photo: Kitsap Sun, Feb. 4, 2014
Work continues at the Central Kitsap Wastewater Treatment Plant // File photo: Kitsap Sun, Feb. 4, 2014

The nearby Silverdale Water District has installed about 15,000 feet of “purple pipe” for reclaimed water on the major arterials of Silverdale, including Silverdale Way. The project is part of the water district’s major pipe-replacement project. Another 2,000 feet will be added as part of the Bucklin Hill Bridge project, General Manager Morgan Johnson told me.

Much of the new commercial construction in Silverdale is being designed to use reclaimed water for irrigation, and some buildings are being plumbed to use reclaimed water for flushing toilets and other secondary uses. Ballfields in the area could get some of the water.

A public-outreach program is being planned to educate the public about reclaimed water and to answer questions that people may have. Under the current schedule, the reclaimed-water valve would be turned on in 2020, but that date may be pushed back, Morgan said.

In Kingston, it will take about a year to put the information together and identify a preferred alternative, Barbara told me. Final engineering and design will follow under a new contract if things go as expected.

The current contract will examine pipeline routes to convey the water to the potential users. Costs for building and operating the system will be explored.

Yet to be determined is how costs and benefits of the reclaimed water will be shared between the county, which owns the treatment facilities, and those who will use the water. That goes for both Kingston and Central Kitsap.

Many golf courses across the country — especially in the arid Southwest — are using reclaimed water for irrigation. In a few places where water is in extremely short supply, water systems have begun adding the clean effluent straight into their drinking water. Check out reporter Emily Schmall’s story for the Associated Press.

While water is still somewhat plentiful in the Puget Sound area, it only makes sense to find uses for freshwater that would otherwise be dumped into salty Puget Sound.

Are you ready to water the lawn with treated sewage?

It seems as if it has taken forever for someone in Kitsap County to put treated sewage to beneficial use, but a demonstration project on Retsil Road in South Kitsap is just around the corner. Check out my story in Saturday’s Kitsap Sun.

Darren Noon of Pape and Sons Construction Co. welds a section of "purple pipe" along Retsil Road in South Kitsap, the first reclaimed water project in Kitsap County.
Kitsap Sun photo by Meegan M. Reid

Local water experts were contemplating uses for highly treated wastewater even before “low-impact development” became a common phrase for infiltrating stormwater into the ground.

LID has caught on fairly quickly as a method of keeping polluted stormwater from reaching our streams and Puget Sound. The concept got an extra push from new stormwater regulations, which have greatly increased the cost of conventional pipe-and-pond methods of stormwater management.

The less-touted benefit of LID is groundwater recharge, which boosts our long-range water supply.

Kitsap County’s Watershed Management Plan (PDF 147 kb), developed in 2005, estimated that Kitsap County’s sewage treatment plants release 8 million gallons of treated water into Puget Sound each day. That’s enough to increase the base flow of 10 streams by 10 cubic feet per second, raise aquifer levels throughout the county or launch a new industry without touching our drinking water supplies.

“The most significant barriers to recycling wastewater are the cost of infrastructure and additional treatment, as well as public perception,” the report states. “Elected officials in WRIA 15 (the Kitsap Peninsula) have expressed support for public education about reclaimed water.”

The report mentions that highly treated effluent from the Central Kitsap Wastewater Treatment Plant near Brownsville could be used to supplement streamflows in nearby Steele Creek. But more recently Kitsap County and Silverdale Water District have begun working together on a plan to pipe the water into the heart of Silverdale, where it can be used to water ballfields and landscaping.

That’s also the initial plan put forth by West Sound Utility District, as I mentioned in Saturday’s story. Using wastewater for irrigation cuts down on peak demand, which is what drives water utilities to drill new wells. Needless to say, drilling deep wells comes at a tremendous expense — an expense that grows greater as Kitsap County approaches the limits of its groundwater supplies in some locations.

To many people, using reclaimed wastewater seems like a novel idea, especially in an region known for its rain. People remain squeamish about getting anywhere near sewage water, even if it is treated. But I don’t believe it will take long for people to accept the idea of using treated wastewater for irrigation, once they realize it is treated to basically the same level as drinking water.

On the other hand, drinking treated effluent becomes another issue, even though it has been done indirectly for years in many places. If you live in a town on the Mississippi River, your local utility may be drawing water out of the river for your consumption just downstream of where a sewage treatment plant is dumping its effluent.

There are several other places where reclaimed water is mixed with freshwater, such as in a reservoir, then drawn back out for drinking. Ironically, putting the wastewater into a reservoir makes it seem more palatable, even though it probably was cleaner before. Treating the water in the reservoir is essentially treating the wastewater again — although water is just water in the end.

For a description of reclaimed water systems in the U.S. and elsewhere in the world, check out a fact sheet compiled by Queensland Water Commission, Australia: “Water recycling: Examples from other countries” (PDF 592 kb).

A community in Texas made news across the country last week, when reporter Angela Brown of the Associated Press wrote about a new $13-million water-reclamation plant to turn effluent into drinking water, the first to be built in that state. Really, it is nothing new, as Angela herself points out.

What I have not found anywhere so far is a direct use of reclaimed water. That’s what you would get by pumping the highly treated wastewater directly into a municipal water system’s piping network. From a health standpoint, there would be nothing wrong with that, provided the water could be shut off in the event of a problem at the treatment plant. No doubt this kind of direct use will be a little harder to get used to, even in areas where water is scarce.

Alix Spiegel of National Public Radio does a nice job analyzing the psychology behind the aversion to using treated wastewater and why people are more accepting of indirect use. Read or listen to “Why Cleaned Wastewater Stays Dirty In Our Minds .”