OHA Drinking Water Services
OR41
PWS ID: 91556 ---- CASCADE GORGE PROPERTIES
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
4Q2025 Oct 09, 2025 2DBP-02 RV #5 0.059 0.071 0.035 0.029
3Q2025 Sep 03, 2025 2DBP-02 RV #5 0.043 0.052 0.032 0.032
2Q2025 Jun 20, 2025 2DBP-02 RV #5 0.045 0.045 0.049 0.043
1Q2025 Jan 27, 2025 2DBP-02 RV #5 0.050 0.038 0.054 0.047
4Q2024 Dec 03, 2024 2DBP-02 RV #5 0.054 0.045 0.057 0.046
3Q2024 Sep 26, 2024 2DBP-02 RV #5 0.072 0.069 0.080 0.081
2Q2024 Jun 19, 2024 2DBP-02 RV #5 0.084 0.084 0.077 0.077
1Q2024 2DBP-02 RV #5