Drinking Water Systems in HILLSBORO, Oregon
7 water systems are reported for this city, with a combined service population of 95,102. The systems have 22 EPA violation records in the five-year period ending June 30, 2026.
Water Systems Serving HILLSBORO
RAINBOW ENDS WATER SYSTEM
50 served75 historical records2 recent
B
WOLSBORN FARMS WATER DISTRICT
92 served78 historical records8 recent
C
HILLSBORO-CHERRY GROVE
1,628 served39 historical records4 recent
C
JOINT WATER COMMISSION
0 served35 historical records4 recent
C
SOUTH HILLS WATER SYSTEM
250 served14 historical records
A
FIR GROVE HOMEOWNERS ASSN
450 served25 historical records3 recent
C
HILLSBORO, CITY OF
92,632 served3 historical records1 recent
B
EPA Contaminant Categories in Historical Violation Records
Coliform (TCR)54 records
Consumer Confidence Rule22 records
Lead and Copper Rule12 records
Surface Water Treatment Rule12 records
Xylenes, Total9 records
Total Trihalomethanes (TTHMs)9 records
Haloacetic Acids (HAA5)9 records
Ethylbenzene8 records
Revised Total Coliform Rule8 records
COLIPHAGE6 records
Category counts aggregate historical compliance records across listed systems. They do not show current concentrations or household test results.