OHA Drinking Water Services
OR41
PWS ID: 00783 ---- ORCHARD HEIGHTS WATER ASSN
LRAAs and OELs

LRAA = Locational running annual average; OEL = Operational evaluation level. Learn about OELs here.
Averages are subject to change as new data is taken into consideration.

TTHM MCL = 0.080 mg/L,  HAA5 MCL = 0.060 mg/L.  MCL exceedances are indicated with red text.

Monitoring
Period		 Last
Sample		 Sample
Point		 Location TTHM
LRAA		 TTHM
OEL		 HAA5
LRAA		 HAA5
OEL
1Q2026 2DBP-01 3017 ORCHARD HEIGHTS 0.007 0.006
4Q2025 Nov 19, 2025 2DBP-01 3017 ORCHARD HEIGHTS 0.005 0.007 0.004 0.006
3Q2025 Sep 10, 2025 2DBP-01 3017 ORCHARD HEIGHTS 0.007 0.008 0.004 0.006
2Q2025 Jun 25, 2025 2DBP-01 3017 ORCHARD HEIGHTS 0.005 0.007 0.003 0.004
1Q2025 Feb 11, 2025 2DBP-01 3017 ORCHARD HEIGHTS 0.006 0.003 0.007 0
4Q2024 Oct 28, 2024 2DBP-01 3017 ORCHARD HEIGHTS 0.015 0.008 0.019 0.010
3Q2024 2DBP-01 3017 ORCHARD HEIGHTS 0.014 0.020
2Q2024 Jun 18, 2024 2DBP-01 3017 ORCHARD HEIGHTS 0.014 0.014 0.020 0.020
1Q2024 Mar 18, 2024 2DBP-01 3017 ORCHARD HEIGHTS 0.015 0.018 0.019 0.025
4Q2023 Dec 05, 2023 2DBP-01 3017 ORCHARD HEIGHTS 0.004 0.004 0.003 0.003