1. POTW Pyrethroid Survey Results: Data Review and Summary Yuzhou Luo CDPR/EM/SWPP

2. Overview 32 POTW facilities throughout California (one primary treatment, 18 secondary, 12 tertiary, one unknown) One sampling event for each POTW in early 2013 8 pyrethroids (bifenthrin, cyfluthrin, cypermethrin, deltamethrin, esfenvalerate, fenpropathrin, λ-cyhalothrin, permethrin) Reported data: whole-water concentrations in influent and effluent; concentration in biosolids Samples are not timed between influent, effluent, and biosolids collection

3. Detection Frequency InfluentEffluent bifenthrin96%82% cyfluthrin88%60% cypermethrin81% deltamethrin43%16% esfenvalerate46%32% fenpropathrin4.5%3.2% λ-cyhalothrin81%48% permethrin100%65% Notes: [1] shows averages of detection frequencies by two Labs; [2] limits of detection (LOD) for influent are 4~10 times of those for effluent

4. Concentrations in Effluent The maximum concentration (ng/L) USEPA OPP aquatic life benchmark (ng/L) Fish, acute Fish, chronic Invertebrates, acute Invertebrates, chronic bifenthrin3.975408001.3 cyfluthrin4341012.57 cypermethrin1319514021069 deltamethrin1.229017554.1 esfenvalerate0.635 2517 fenpropathrin0.811009126564 λ-cyhalothrin1.6105313.52 permethrin17039551.5101.4

5. Bifenthrin: Effluent Concentrations Exceedance frequency Detected onlyAll samples Primary100% Secondary29%27% Tertiary0% Overall22%18%

6. Permethrin: Effluent Concentrations Exceedance frequency Detected onlyAll samples Primary100% Secondary100%83% Tertiary100%33% Overall100%65%

7. Percent reduction by treatment types