OHA Drinking Water Services
OR41
PWS ID: 94441 ---- TREE TOP
PFAS Sample Results

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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 WELL GW Permanent 2 samples 1/1/2023 3/16/2026 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
Yes EP-A EP for WELL 03/16/2026 0 1 170-4070-1


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
Yes EP-A EP for WELL 03/16/2026 03/26/2026 2816 HFPO-DA Hexafluoropropylene oxide dimer acid ND 10 2.00 170-4070-1 4034 EUROFINS EATON ANALYTICAL EPA 537.1 PFAS SPE LC/MS/MS 15020 3073738 4084148 Yes 2816M N 4034 EUROFINS EATON ANALYTICAL EPA 537.1 PFAS SPE LC/MS/MS
Yes EP-A EP for WELL 03/16/2026 03/26/2026 2801 PFBS Perfluorobutanesulfonic acid 2.9 2.00 170-4070-1 4034 EUROFINS EATON ANALYTICAL EPA 537.1 PFAS SPE LC/MS/MS 15020 3073738 4084153 Yes 2801M D 4034 EUROFINS EATON ANALYTICAL EPA 537.1 PFAS SPE LC/MS/MS
Yes EP-A EP for WELL 03/16/2026 03/26/2026 2803 PFHxS Perfluorohexanesulfonic acid 11 10 2.00 170-4070-1 4034 EUROFINS EATON ANALYTICAL EPA 537.1 PFAS SPE LC/MS/MS 15020 3073738 4084152 Yes 2803M DE 4034 EUROFINS EATON ANALYTICAL EPA 537.1 PFAS SPE LC/MS/MS
Yes EP-A EP for WELL 03/16/2026 03/26/2026 2804 PFNA Perfluorononanoic acid ND 10 2.00 170-4070-1 4034 EUROFINS EATON ANALYTICAL EPA 537.1 PFAS SPE LC/MS/MS 15020 3073738 4084151 Yes 2804M N 4034 EUROFINS EATON ANALYTICAL EPA 537.1 PFAS SPE LC/MS/MS
Yes EP-A EP for WELL 03/16/2026 03/26/2026 2806 PFOA Perfluorooctanoic acid ND 4.0 2.00 170-4070-1 4034 EUROFINS EATON ANALYTICAL EPA 537.1 PFAS SPE LC/MS/MS 15020 3073738 4084149 Yes 2806M N 4034 EUROFINS EATON ANALYTICAL EPA 537.1 PFAS SPE LC/MS/MS
Yes EP-A EP for WELL 03/16/2026 03/26/2026 2805 PFOS Perfluorooctanesulfonic acid 2.4 4.0 2.00 170-4070-1 4034 EUROFINS EATON ANALYTICAL EPA 537.1 PFAS SPE LC/MS/MS 15020 3073738 4084150 Yes 2805M D 4034 EUROFINS EATON ANALYTICAL EPA 537.1 PFAS SPE LC/MS/MS