Voluntary sampling and results

With the installation of our Advanced Treatment processes in 2020, Castle Rock Water began to regularly conduct additional testing for non-regulated contaminants such as PFAS.

  • Prior to June 15, 2022, only PFOA and PFOS had advisory limits set at 70 parts per trillion (ppt).
  • As of June 15, 2022, the EPA released much lower health advisories for two PFAS compounds PFOA and PFOS and issued health advisories for two new compounds - GenX and PFBS.
  • Castle Rock Water has been sampling at our Plum Creek Water Purification Facility for these four PFAS substances as well as many others since July 2020. Results of the sampling at the entrance to our distribution system at the Plum Creek Water Purification Facility are shown below.

PFAS Compounds Testing Results 2020 to 2022ND = Non-detect | ^nanograms per liter (ng/L) = parts per trillion (ppt)

Castle Rock Water will continue testing for PFAS at the Plum Creek Water Purification Facility as part of our monitoring protocols. While we can effectively treat and remove PFAS at the Plum Creek Water Purification Facility, we regularly examine our treatment system and adjust these processes as part of our mission to provide safe, dependable and sustainable water now and in the future.

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1. Why are we hearing about PFAS now if they've been around for decades?
2. Are PFAS regulated?
3. What is a health advisory?
4. What are the potential health effects of PFAS?
5. Why aren't PFAS listed in the 2022 Water Quality Report?
6. Voluntary sampling and results
7. Required PFAS Sampling in 2023
8. Castle Rock Water's treatment process
9. What is Castle Rock Water doing about PFAS?
10. If PFAS are in so many consumer goods, why haven't I heard about the PFAS levels in them?
11. Is bottled water safe from PFAS?
12. How can you help protect water quality?
13. I received information about a water filter, but a company gave me a quote that cost hundreds or thousands of dollars. Do I really need a water filter?