OHA Drinking Water Services
OR41
PWS ID: 00932 ---- WARRENTON, CITY OF
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 22, 2025 2DBP-01 SM-4 CITY LAB 0.032 0.037 0.024 0.033
4Q2025 Oct 22, 2025 2DBP-02 S1-1 905 5TH ST 0.035 0.042 0.024 0.032
3Q2025 Jul 23, 2025 2DBP-01 SM-4 CITY LAB 0.028 0.029 0.017 0.017
3Q2025 Jul 23, 2025 2DBP-02 S1-1 905 5TH ST 0.031 0.033 0.018 0.019
2Q2025 May 06, 2025 2DBP-01 SM-4 CITY LAB 0.025 0.026 0.016 0.017
2Q2025 May 06, 2025 2DBP-02 S1-1 905 5TH ST 0.027 0.027 0.016 0.017
1Q2025 Feb 12, 2025 2DBP-01 SM-4 CITY LAB 0.022 0.022 0.012 0.012
1Q2025 Feb 12, 2025 2DBP-02 S1-1 905 5TH ST 0.025 0.025 0.013 0.013
4Q2014 Nov 18, 2014 2DBP-01 SM-4 CITY LAB 0.034 0.035 0.019 0.019
4Q2014 Nov 18, 2014 2DBP-02 S1-1 905 5TH ST 0.031 0.035 0.018 0.019
3Q2014 Aug 18, 2014 2DBP-01 SM-4 CITY LAB 0.038 0.033 0.021 0.017
3Q2014 Aug 18, 2014 2DBP-02 S1-1 905 5TH ST 0.027 0.028 0.017 0.017
2Q2014 May 19, 2014 2DBP-01 SM-4 CITY LAB 0.030 0.035 0.017 0.020
2Q2014 May 19, 2014 2DBP-02 S1-1 905 5TH ST 0.016 0.024 0.011 0.015
1Q2014 Feb 17, 2014 2DBP-01 SM-4 CITY LAB 0.024 0.013
1Q2014 Feb 17, 2014 2DBP-02 S1-1 905 5TH ST 0.009 0.007
4Q2013 Nov 14, 2013 2DBP-01 SM-4 CITY LAB 0.015 0.008
4Q2013 2DBP-02 S1-1 905 5TH ST