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State environmental staff detail POET monitoring results; effluent standard exceedances rare
Summary
Environmental Service Department staff reported on the point-of-entry treatment (POET) monitoring program: 841 systems installed, 824 confirmed online, ~2,300 samples collected, 22 effluent detections and three ambient groundwater quality standard (AGQS) exceedances (two later traced to sampling errors).
Mike, a Department of Environmental Service Department (DEES) representative, summarized the agency’s point-of-entry treatment (POET) monitoring program and its findings. He told the commission the program has tracked 841 POET systems installed since 2022, of which 824 have been cleared as effective and online. Contractors confirm system efficacy before a unit is placed into operation, and homeowners receive bottled water until a system is confirmed.
The monitoring program has collected roughly 2,300 samples: 913 installation confirmation samples and 1,384 routine maintenance samples. Of the routine samples, 240 midfluents had detections at or above the program’s 2 parts-per-trillion detection threshold. Treated-water (effluent) sampling returned 22 detections; Mike said only three of those represented apparent exceedances of the ambient groundwater quality standard (AGQS), and two of those three were later attributed to sample swaps or lab errors. "The good news is it means we don't see that very often," Mike said, adding that when the program does detect a true problem, the monitoring has identified issues that were corrected.
Under DEES’s monitoring rules, influent (raw well) sampling frequency is tied to measured PFOA concentrations: annual influent sampling when results are ≤18 parts per trillion (ppt) and twice-yearly sampling when influent exceeds 18 ppt. Midpoint samples (taken after the first GAC tank in a twin-tank system) are monitored most frequently to detect early breakthrough; if a midfluet result is ≥2 ppt and the influent exceeds the AGQS, the effluent sample is analyzed. Mike emphasized that midfluet monitoring helps identify when a lead carbon vessel is starting to leak through so media change-outs can be scheduled.
DEES provides homeowners with test results within 45 days of sample collection; if an effluent sample exceeds AGQS the homeowner is notified within 24 hours and interim bottled water is supplied until a repair and confirmation sampling show the system is operating properly. Mike said DEES receives bimonthly status reports from the company and an annual summary report from the monitoring program.
Why it matters: POET systems are being used where waterline connection is not feasible; rigorous monitoring and prompt remedial action are the mechanisms DEES is using to ensure treated water meets state standards. The program’s detection but low rate of true effluent violations indicates most systems are operating as designed, while the monitoring program creates the opportunity to detect and fix failures.
Next steps: DEES will continue the sampling cadence under the revised groundwater management zone work plan and provide further reporting at future commission meetings.
