OHA Drinking Water Services
OR41
PWS ID: 00985 ---- HILLSBORO-CHERRY GROVE
Single Chemical Schedule

Return to Chemical Schedule Details

Facility
ID
Facility Name Analyte
Code
Analyte Sampling
Interval
Monitoring
Period
Start
Monitoring
Period
Due Date
Days
Until
Due
Samples
Required
Samples
Received
Last
Sample
Date
Seasonal Sampling
Period
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2981 1,1,1-TRICHLOROETHANE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2985 1,1,2-TRICHLOROETHANE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2977 1,1-DICHLOROETHYLENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2378 1,2,4-TRICHLOROBENZENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2980 1,2-DICHLOROETHANE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2983 1,2-DICHLOROPROPANE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2990 BENZENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2982 CARBON TETRACHLORIDE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2989 CHLOROBENZENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2380 CIS-1,2-DICHLOROETHYLENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2964 DICHLOROMETHANE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2992 ETHYLBENZENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2968 O-DICHLOROBENZENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2969 P-DICHLOROBENZENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2996 STYRENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2987 TETRACHLOROETHYLENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2991 TOLUENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2979 TRANS-1,2-DICHLOROETHYLENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2984 TRICHLOROETHYLENE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2976 VINYL CHLORIDE Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026
EP-A EP FOR UPPER TUALATIN R. - HAINES FALLS 2955 XYLENES, TOTAL Yearly1/1/2026 - 12/31/2026 238 1 1 4/1/2026