OHA Drinking Water Services
OR41
PWS ID: 05086 ---- POLEHN HEIGHTS WATER ASSN
PFAS Sample Results

Table is loading - please wait...


Initial Monitoring
EP ID Entry point name Water
type
Availability Frequency Schedule
begin
Schedule
end
First quarter or
First sample
Second quarter or
Second sample
Third
quarter
Fourth
quarter
EP-A EP FOR WELLS #1 & #2 GW Permanent 2 samples 1/1/2023 1/27/2026 N/A N/A
For each active entry point served by groundwater, collect 2 consecutive samples within a 12-month period with samples collected 5 to 7 months apart.


Sample Summaries
For compliance? EP ID Entry point name Sample date # Detections # MCL
exceedances
Sample ID
No EP-A EP FOR WELLS #1 & #2 12/01/2021 0 0 2112023-01
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 0 0 2601204-01


Sample Results
For compliance? EP ID
Entry point name Sample date Received date Analyte
code
Analyte abbreviation
Analyte name
Result (ng/L)
MCL
(ng/L)
MRL
(ng/L)
Sample ID Lab ID Lab name Analysis method Method name TINWSF
ISN
TSASAMPL
ISN
TSASAR
ISN
SelectDataSet SelectAnalyte SelectDetects SelectLabID SelectLabName SelectMethod SelectMethodName
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2813 11Cl-PF3OUdS 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213322 No 2813 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2821 4:2FTS 1H,1H, 2H, 2H-Perfluorohexane sulfonic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3212854 No 2821 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2820 6:2FTS 1H,1H, 2H, 2H-Perfluorooctane sulfonic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3212932 No 2820 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2822 8:2FTS 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3212776 No 2822 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2814 9Cl-PF3ONS 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acd ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213244 No 2814 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2815 ADONA 4,8-Dioxa-3H-perfluorononanoic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213166 No 2815 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2816 HFPO-DA Hexafluoropropylene oxide dimer acid ND 10 103 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213088 No 2816M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2819 PFBA Perfluorobutanoic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213010 No 2819 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2801 PFBS Perfluorobutanesulfonic acid ND 41.0 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3214102 No 2801M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2807 PFDA Perfluorodecanoic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213634 No 2807 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2808 PFDoA Perfluorododecanoic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213556 No 2808 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2826 PFEESA Perfluoro(2-ethoxyethane)sulfonic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3212464 No 2826 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2802 PFHpA Perfluoroheptanoic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3214024 No 2802 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2829 PFHpS Perfluoroheptanesulfonic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3212308 No 2829 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2809 PFHxA Perfluorohexanoic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213478 No 2809 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2803 PFHxS Perfluorohexanesulfonic acid ND 10 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213946 No 2803M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2825 PFMBA Perfluoro-4-methoxybutanoic acid ND 20.5 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3212542 No 2825 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2823 PFMPA Perfluoro-3-methoxypropanoic acid ND 41.0 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3212698 No 2823 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2804 PFNA Perfluorononanoic acid ND 10 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213868 No 2804M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2806 PFOA Perfluorooctanoic acid ND 4.0 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213712 No 2806M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2805 PFOS Perfluorooctanesulfonic acid ND 4.0 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213790 No 2805M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2824 PFPeA Perfluoropentanoic acid ND 103 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3212620 No 2824 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2828 PFPeS Perfluoropentanesulfonic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3212386 No 2828 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELLS #1 & #2 12/01/2021 01/27/2022 2812 PFUnA Perfluoroundecanoic acid ND 10.3 2112023-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 2427631 3213400 No 2812 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2813 11Cl-PF3OUdS 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099625 Yes 2813 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2821 4:2FTS 1H,1H, 2H, 2H-Perfluorohexane sulfonic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099499 Yes 2821 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2820 6:2FTS 1H,1H, 2H, 2H-Perfluorooctane sulfonic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099520 Yes 2820 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2822 8:2FTS 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099478 Yes 2822 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2814 9Cl-PF3ONS 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acd ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099604 Yes 2814 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2815 ADONA 4,8-Dioxa-3H-perfluorononanoic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099583 Yes 2815 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2816 HFPO-DA Hexafluoropropylene oxide dimer acid ND 10 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099562 Yes 2816M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2827 NFDHA Nonafluoro-3,6-dioxaheptanoic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099373 Yes 2827 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2819 PFBA Perfluorobutanoic acid ND 4.69 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099541 Yes 2819 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2801 PFBS Perfluorobutanesulfonic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099835 Yes 2801M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2807 PFDA Perfluorodecanoic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099709 Yes 2807 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2808 PFDoA Perfluorododecanoic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099688 Yes 2808 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2826 PFEESA Perfluoro(2-ethoxyethane)sulfonic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099394 Yes 2826 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2802 PFHpA Perfluoroheptanoic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099814 Yes 2802 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2829 PFHpS Perfluoroheptanesulfonic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099331 Yes 2829 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2809 PFHxA Perfluorohexanoic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099667 Yes 2809 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2803 PFHxS Perfluorohexanesulfonic acid ND 10 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099793 Yes 2803M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2825 PFMBA Perfluoro-4-methoxybutanoic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099415 Yes 2825 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2823 PFMPA Perfluoro-3-methoxypropanoic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099457 Yes 2823 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2804 PFNA Perfluorononanoic acid ND 10 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099772 Yes 2804M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2806 PFOA Perfluorooctanoic acid ND 4.0 1.41 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099730 Yes 2806M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2805 PFOS Perfluorooctanesulfonic acid ND 4.0 1.41 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099751 Yes 2805M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2824 PFPeA Perfluoropentanoic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099436 Yes 2824 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2828 PFPeS Perfluoropentanesulfonic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099352 Yes 2828 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELLS #1 & #2 01/27/2026 04/21/2026 2812 PFUnA Perfluoroundecanoic acid ND 1.87 2601204-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 17490 3084710 4099646 Yes 2812 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS