Wastewater

Ever wonder about wastewater?

After you use the water in your home, it flows through the drain and into the wastewater (sanitary sewer) pipes to the wastewater treatment facility called the Plum Creek Water Reclamation Authority (PCWRA). Castle Rock Water maintains 280 miles of sewer lines and 10 lift stations that transport that wastewater to the treatment facility. For general maintenance and to prevent overflows, Castle Rock Water monitors inside these sewer lines and jet cleans them periodically. Services also include identifying and replacing damaged and aging infrastructure.

Plum Creek Water Reclamation Authority

The Plum Creek Water Reclamation Authority is an independent wastewater treatment facility that collects and treats the wastewater for five communities. It is governed by a board of directors from three of the five communities it serves: Town of Castle Rock, Castle Pines Metropolitan District, and Castle Pines North Metropolitan District.

Wastewater treatment - first steps

At the wastewater treatment plant there are several processes designed to remove contaminants and disinfect the wastewater so that it meets State and Federal regulations. 

  • The first step in wastewater treatment is to collect samples and measure the flow into the facility. 
  • Larger non-biodegradable materials are then removed with mechanical screens.
  • The screened wastewater then flows into settling basins where heavier particles such as sand, gravel and eggshells settle to the bottom of the basins and are removed from the process 

These first steps of treatment are important to protect the downstream processes and equipment in the facility. 

PCWRA plant

Secondary treatment

Secondary treatment is the biological stage and involves microscopic organisms and bacteria that are responsible for the majority of the treatment process. 

  • Wastewater is treated for 24 to 36 hours in large tanks (image) where the bacteria consume various contaminants, specifically the biodegradable organics, ammonia, carbon and phosphorous. 
  • Once treated, wastewater flows into large clarifying tanks where the bacteria and microorganisms settle to the bottom and are separated from the treated wastewater. 
  • These bacteria and other organic residue is dewatered with centrifuges creating a usable bio-solid. These bio-solids are hauled away to be beneficially reused as fertilizers to improve soil conditions in crop and range land.  
  • Treated wastewater from the clarifiers is filtered and disinfected using ultra-violet light to deactivate or kill any remaining pathogenic microorganisms. 
  • The treated water is then measured, sampled and tested to ensure it meets or exceeds State and Federal requirements. 
  • The final water (effluent)is then either released into Plum Creek or pumped to local golf courses to be used for irrigation. 

To learn more and arrange tours of the facility, visit PCWRAcolorado.org.

Pollutants 

The Plum Creek Water Reclamation Authority wastewater treatment facility services five residential-focused communities with very little industrial, agricultural or medical waste. Therefore, most of the pollutants are domestic, meaning they come from people. Many of these pollutants can be reduced by everyday actions. Reducing pollutants going into the system will reduce costs for treatment.

  1. Don’t use flushable wipes. While labeled as "flushable," these wipes do not disintegrate like toilet paper and often clog pipes, create sanitary sewer overflows and damage equipment at the wastewater plant. 
  2. Don’t use the toilet as a trash can. Not only does this waste water, these items can create obstructions potentially causing sewer overflows and costly removal at the wastewater plant. 
  3. Don’t flush medications. Dispose of expired or unused medications in the lobby of the Castle Rock Police Department. Advanced treatment options are needed to filter pharmaceuticals.
  4. Don’t wash fats, oil and grease (FOGs) down the drain.  FOGs will line the pipes causing buildup in the collection systems, leading to sanitary sewer overflows. FOG is also difficult to remove at the wastewater plant. Scrape food scraps and FOGs into the trash where they can be properly disposed.
  5. Choose phosphate-free detergents, soaps and household cleaners. Excessive phosphorous is expensive to treat for at the wastewater plant and creates algae blooms which negatively affect a natural ecosystem.

Another important note, storm drains are not part of the wastewater (sanitary sewer) collection system. The many stormwater pipes in our streets and neighborhoods help manage potential flooding by taking rainwater and snow melt through detention ponds and channels and to the creek. Stormwater pipes and channels do not go to the wastewater treatment facility. This direct lineage to the stream is why it is so critical to not dump anything down the stormdrain.  

PCWRA Expansion Project

Plans are underway to expand the wastewater treatment facility to treat 3 million gallons of water day. That expansion will take the facility from 6.44 million to 9.44 million gallons per day.

The expansion is needed due to population increases that the area is experiencing. As Castle Rock is the largest populated partner, we are responsible for a majority of the cost of this expansion. The funding for the expansion comes from system development fees which are paid by developers. Customer rates will not be used for the expansion portion of the project. 

The project is currently under construction with completion planned for 2020.