OHA Drinking Water Services
OR41
PWS ID: 00372 ---- HERMISTON, 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
1Q2024 Mar 06, 2024 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.031 0.026 0.009 0.008
1Q2024 Mar 06, 2024 2DBP-03 WESTSIDE LIFT STATION 0.041 0.041 0.009 0.009
1Q2024 Mar 06, 2024 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.019 0.021 0.006 0.006
1Q2024 Mar 06, 2024 2DBP-05 JOSEPH BOOSTER STATION 0.024 0.023 0.008 0.010
4Q2023 Dec 06, 2023 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.032 0.028 0.009 0.008
4Q2023 Dec 06, 2023 2DBP-03 WESTSIDE LIFT STATION 0.041 0.041 0.011 0.009
4Q2023 Dec 06, 2023 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.019 0.018 0.007 0.004
4Q2023 Dec 06, 2023 2DBP-05 JOSEPH BOOSTER STATION 0.025 0.026 0.011 0.006
3Q2023 Sep 12, 2023 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.036 0.036 0.016 0.012
3Q2023 Sep 12, 2023 2DBP-03 WESTSIDE LIFT STATION 0.042 0.041 0.016 0.011
3Q2023 Sep 12, 2023 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.021 0.018 0.008 0.007
3Q2023 Sep 12, 2023 2DBP-05 JOSEPH BOOSTER STATION 0.027 0.024 0.013 0.011
2Q2023 Jun 07, 2023 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.035 0.040 0.020 0.016
2Q2023 Jun 07, 2023 2DBP-03 WESTSIDE LIFT STATION 0.043 0.042 0.021 0.016
2Q2023 Jun 07, 2023 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.022 0.021 0.010 0.008
2Q2023 Jun 07, 2023 2DBP-05 JOSEPH BOOSTER STATION 0.028 0.026 0.017 0.013
1Q2023 Mar 14, 2023 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.032 0.032 0.022 0.020
1Q2023 Mar 14, 2023 2DBP-03 WESTSIDE LIFT STATION 0.043 0.044 0.024 0.024
1Q2023 Mar 14, 2023 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.022 0.024 0.010 0.011
1Q2023 Mar 14, 2023 2DBP-05 JOSEPH BOOSTER STATION 0.030 0.029 0.022 0.022
4Q2022 Dec 12, 2022 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.032 0.033 0.023 0.027
4Q2022 Dec 12, 2022 2DBP-03 WESTSIDE LIFT STATION 0.044 0.043 0.025 0.026
4Q2022 Dec 12, 2022 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.023 0.022 0.009 0.008
4Q2022 Dec 12, 2022 2DBP-05 JOSEPH BOOSTER STATION 0.032 0.032 0.021 0.020
3Q2022 Sep 12, 2022 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.032 0.031 0.019 0.023
3Q2022 Sep 12, 2022 2DBP-03 WESTSIDE LIFT STATION 0.046 0.043 0.028 0.026
3Q2022 Sep 12, 2022 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.025 0.021 0.012 0.011
3Q2022 Sep 12, 2022 2DBP-05 JOSEPH BOOSTER STATION 0.030 0.030 0.022 0.023
2Q2022 Jun 13, 2022 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.034 0.033 0.014 0.016
2Q2022 Jun 13, 2022 2DBP-03 WESTSIDE LIFT STATION 0.046 0.046 0.022 0.026
2Q2022 Jun 13, 2022 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.027 0.025 0.009 0.010
2Q2022 Jun 13, 2022 2DBP-05 JOSEPH BOOSTER STATION 0.032 0.032 0.022 0.022
1Q2022 Mar 08, 2022 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.034 0.034 0.013 0.012
1Q2022 Mar 08, 2022 2DBP-03 WESTSIDE LIFT STATION 0.040 0.047 0.020 0.023
1Q2022 Mar 08, 2022 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.029 0.030 0.011 0.010
1Q2022 Mar 08, 2022 2DBP-05 JOSEPH BOOSTER STATION 0.032 0.032 0.022 0.022
4Q2021 Dec 14, 2021 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.035 0.034 0.013 0.013
4Q2021 Dec 14, 2021 2DBP-02 3 SNAKCORP 0.031 0.033 0.043 0.045
4Q2021 Dec 14, 2021 2DBP-03 WESTSIDE LIFT STATION 0.039 0.042 0.018 0.024
4Q2021 Dec 14, 2021 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.029 0.031 0.011 0.012
3Q2021 Sep 15, 2021 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.035 0.037 0.013 0.012
3Q2021 Sep 15, 2021 2DBP-02 3 SNAKCORP 0.029 0.032 0.042 0.041
3Q2021 Sep 15, 2021 2DBP-03 WESTSIDE LIFT STATION 0.035 0.036 0.012 0.009
3Q2021 Sep 15, 2021 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.026 0.026 0.010 0.008
2Q2021 Jun 09, 2021 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.034 0.033 0.021 0.015
2Q2021 Jun 09, 2021 2DBP-02 3 SNAKCORP 0.031 0.029 0.035 0.043
2Q2021 Jun 09, 2021 2DBP-03 WESTSIDE LIFT STATION 0.035 0.028 0.015 0.014
2Q2021 Jun 09, 2021 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.026 0.025 0.011 0.012
1Q2021 Mar 11, 2021 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.031 0.034 0.020 0.021
1Q2021 Mar 11, 2021 2DBP-02 3 SNAKCORP 0.030 0.028 0.037 0.033
1Q2021 Mar 11, 2021 2DBP-03 WESTSIDE LIFT STATION 0.040 0.042 0.014 0.015
1Q2021 Mar 11, 2021 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.021 0.027 0.008 0.011
4Q2020 Dec 07, 2020 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.032 0.029 0.019 0.019
4Q2020 Dec 07, 2020 2DBP-02 3 SNAKCORP 0.029 0.030 0.036 0.038
4Q2020 Dec 07, 2020 2DBP-03 WESTSIDE LIFT STATION 0.040 0.039 0.015 0.014
4Q2020 Dec 07, 2020 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.020 0.021 0.007 0.007
3Q2020 Sep 15, 2020 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.034 0.034 0.020 0.025
3Q2020 Sep 15, 2020 2DBP-02 3 SNAKCORP 0.028 0.033 0.036 0.030
3Q2020 Sep 15, 2020 2DBP-03 WESTSIDE LIFT STATION 0.041 0.042 0.016 0.016
3Q2020 Sep 15, 2020 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.021 0.021 0.008 0.006
2Q2020 Jun 08, 2020 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.037 0.030 0.015 0.012
2Q2020 Jun 08, 2020 2DBP-02 3 SNAKCORP 0.027 0.025 0.043 0.046
2Q2020 Jun 08, 2020 2DBP-03 WESTSIDE LIFT STATION 0.037 0.039 0.015 0.015
2Q2020 Jun 08, 2020 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.020 0.015 0.009 0.009
1Q2020 Mar 23, 2020 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.042 0.042 0.019 0.016
1Q2020 Mar 23, 2020 2DBP-02 3 SNAKCORP 0.029 0.024 0.047 0.038
1Q2020 Mar 23, 2020 2DBP-03 WESTSIDE LIFT STATION 0.035 0.039 0.015 0.016
1Q2020 Mar 23, 2020 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.024 0.025 0.010 0.012
4Q2019 Dec 17, 2019 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.036 0.041 0.023 0.021
4Q2019 Dec 17, 2019 2DBP-02 3 SNAKCORP 0.032 0.029 0.044 0.048
4Q2019 Dec 17, 2019 2DBP-03 WESTSIDE LIFT STATION 0.032 0.035 0.015 0.015
4Q2019 Dec 17, 2019 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.024 0.025 0.011 0.011
3Q2019 Sep 18, 2019 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.038 0.037 0.022 0.024
3Q2019 Sep 18, 2019 2DBP-02 3 SNAKCORP 0.032 0.035 0.041 0.044
3Q2019 Sep 18, 2019 2DBP-03 WESTSIDE LIFT STATION 0.032 0.028 0.012 0.013
3Q2019 Sep 18, 2019 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.025 0.022 0.010 0.010
2Q2019 Jun 03, 2019 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.038 0.037 0.016 0.023
2Q2019 Jun 03, 2019 2DBP-02 3 SNAKCORP 0.035 0.033 0.040 0.049
2Q2019 Jun 03, 2019 2DBP-03 WESTSIDE LIFT STATION 0.030 0.032 0.010 0.012
2Q2019 Jun 03, 2019 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.026 0.025 0.008 0.009
1Q2019 Mar 05, 2019 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.037 0.032 0.012 0.017
1Q2019 Mar 05, 2019 2DBP-02 3 SNAKCORP 0.039 0.033 0.039 0.027
1Q2019 Mar 05, 2019 2DBP-03 WESTSIDE LIFT STATION 0.031 0.031 0.009 0.012
1Q2019 Mar 05, 2019 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.025 0.027 0.009 0.011
4Q2018 Dec 03, 2018 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.045 0.045 0.008 0.009
4Q2018 Dec 03, 2018 2DBP-02 3 SNAKCORP 0.039 0.037 0.045 0.041
4Q2018 Dec 03, 2018 2DBP-03 WESTSIDE LIFT STATION 0.031 0.035 0.008 0.006
4Q2018 Dec 03, 2018 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.027 0.027 0.008 0.007
3Q2018 Sep 05, 2018 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.041 0.044 0.005 0.006
3Q2018 Sep 05, 2018 2DBP-02 3 SNAKCORP 0.042 0.044 0.051 0.047
3Q2018 Sep 05, 2018 2DBP-03 WESTSIDE LIFT STATION 0.027 0.025 0.008 0.007
3Q2018 Sep 05, 2018 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.023 0.024 0.006 0.006
2Q2018 Jun 04, 2018 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.043 0.040 0.006 0.007
2Q2018 Jun 04, 2018 2DBP-02 3 SNAKCORP 0.045 0.045 0.054 0.059
2Q2018 Jun 04, 2018 2DBP-03 WESTSIDE LIFT STATION 0.030 0.029 0.009 0.009
2Q2018 Jun 04, 2018 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.023 0.022 0.007 0.007
1Q2018 Mar 13, 2018 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.046 0.046 0.004 0.006
1Q2018 Mar 13, 2018 2DBP-02 3 SNAKCORP 0.042 0.039 0.051 0.048
1Q2018 Mar 13, 2018 2DBP-03 WESTSIDE LIFT STATION 0.029 0.030 0.010 0.010
1Q2018 Mar 13, 2018 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.022 0.028 0.006 0.008
4Q2017 Dec 04, 2017 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.042 0.042 0.003 0.002
4Q2017 Dec 04, 2017 2DBP-02 3 SNAKCORP 0.040 0.043 0.050 0.052
4Q2017 Dec 04, 2017 2DBP-03 WESTSIDE LIFT STATION 0.029 0.029 0.008 0.008
4Q2017 Dec 04, 2017 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.019 0.017 0.005 0.005
3Q2017 Sep 11, 2017 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.045 0.048 0.004 0.003
3Q2017 Sep 11, 2017 2DBP-02 3 SNAKCORP 0.037 0.046 0.044 0.050
3Q2017 Sep 11, 2017 2DBP-03 WESTSIDE LIFT STATION 0.030 0.029 0.008 0.009
3Q2017 Sep 11, 2017 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.021 0.021 0.006 0.005
2Q2017 Jun 22, 2017 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.042 0.043 0.007 0.004
2Q2017 Jun 22, 2017 2DBP-02 3 SNAKCORP 0.032 0.034 0.041 0.045
2Q2017 Jun 22, 2017 2DBP-03 WESTSIDE LIFT STATION 0.030 0.030 0.008 0.009
2Q2017 Jun 22, 2017 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.021 0.019 0.006 0.006
1Q2017 Mar 02, 2017 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.039 0.038 0.008 0.009
1Q2017 Mar 02, 2017 2DBP-02 3 SNAKCORP 0.029 0.026 0.039 0.037
1Q2017 Mar 02, 2017 2DBP-03 WESTSIDE LIFT STATION 0.029 0.030 0.008 0.007
1Q2017 Mar 02, 2017 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.021 0.022 0.007 0.007
4Q2016 Dec 06, 2016 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.039 0.041 0.010 0.008
4Q2016 Dec 06, 2016 2DBP-02 3 SNAKCORP 0.031 0.029 0.039 0.036
4Q2016 Dec 06, 2016 2DBP-03 WESTSIDE LIFT STATION 0.029 0.031 0.008 0.007
4Q2016 Dec 06, 2016 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.022 0.021 0.009 0.008
3Q2016 Sep 06, 2016 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.036 0.039 0.011 0.011
3Q2016 Sep 06, 2016 2DBP-02 3 SNAKCORP 0.031 0.034 0.039 0.041
3Q2016 Sep 06, 2016 2DBP-03 WESTSIDE LIFT STATION 0.027 0.028 0.009 0.009
3Q2016 Sep 06, 2016 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.022 0.022 0.010 0.008
2Q2016 Jun 07, 2016 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.035 0.035 0.009 0.009
2Q2016 Jun 07, 2016 2DBP-02 3 SNAKCORP 0.031 0.031 0.039 0.042
2Q2016 Jun 07, 2016 2DBP-03 WESTSIDE LIFT STATION 0.024 0.025 0.009 0.010
2Q2016 Jun 07, 2016 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.022 0.021 0.010 0.011
1Q2016 Mar 07, 2016 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.031 0.033 0.009 0.011
1Q2016 Mar 07, 2016 2DBP-02 3 SNAKCORP 0.030 0.029 0.034 0.037
1Q2016 Mar 07, 2016 2DBP-03 WESTSIDE LIFT STATION 0.030 0.026 0.008 0.008
1Q2016 Mar 07, 2016 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.022 0.024 0.009 0.011
4Q2015 Dec 03, 2015 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.032 0.030 0.008 0.009
4Q2015 Dec 03, 2015 2DBP-02 3 SNAKCORP 0.029 0.029 0.031 0.031
4Q2015 Dec 03, 2015 2DBP-03 WESTSIDE LIFT STATION 0.031 0.030 0.006 0.008
4Q2015 Dec 03, 2015 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.022 0.022 0.008 0.009
3Q2015 Sep 02, 2015 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.033 0.034 0.010 0.007
3Q2015 Sep 02, 2015 2DBP-02 3 SNAKCORP 0.030 0.033 0.033 0.034
3Q2015 Sep 02, 2015 2DBP-03 WESTSIDE LIFT STATION 0.034 0.029 0.008 0.005
3Q2015 Sep 02, 2015 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.022 0.020 0.008 0.006
2Q2015 Jun 08, 2015 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.035 0.030 0.011 0.010
2Q2015 Jun 08, 2015 2DBP-02 3 SNAKCORP 0.035 0.028 0.037 0.030
2Q2015 Jun 08, 2015 2DBP-03 WESTSIDE LIFT STATION 0.036 0.040 0.009 0.008
2Q2015 Jun 08, 2015 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.024 0.023 0.008 0.008
1Q2015 Mar 18, 2015 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.036 0.036 0.012 0.011
1Q2015 Mar 18, 2015 2DBP-02 3 SNAKCORP 0.038 0.033 0.042 0.037
1Q2015 Mar 18, 2015 2DBP-03 WESTSIDE LIFT STATION 0.029 0.032 0.012 0.008
1Q2015 Mar 18, 2015 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.022 0.025 0.008 0.009
4Q2014 Dec 03, 2014 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.035 0.037 0.013 0.015
4Q2014 Dec 03, 2014 2DBP-02 3 SNAKCORP 0.037 0.039 0.042 0.044
4Q2014 Dec 03, 2014 2DBP-03 WESTSIDE LIFT STATION 0.033 0.032 0.013 0.015
4Q2014 Dec 03, 2014 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.024 0.023 0.008 0.009
3Q2014 Sep 23, 2014 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.034 0.037 0.012 0.012
3Q2014 Sep 23, 2014 2DBP-02 3 SNAKCORP 0.037 0.045 0.045 0.048
3Q2014 Sep 23, 2014 2DBP-03 WESTSIDE LIFT STATION 0.032 0.031 0.011 0.011
3Q2014 Sep 23, 2014 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.025 0.024 0.007 0.006
2Q2014 Jun 09, 2014 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.023 0.031 0.009 0.012
2Q2014 Jun 09, 2014 2DBP-02 3 SNAKCORP 0.023 0.034 0.031 0.043
2Q2014 Jun 09, 2014 2DBP-03 WESTSIDE LIFT STATION 0.024 0.029 0.008 0.014
2Q2014 Jun 09, 2014 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.018 0.022 0.006 0.007
1Q2014 Mar 06, 2014 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.015 0.006
1Q2014 Mar 06, 2014 2DBP-02 3 SNAKCORP 0.012 0.018
1Q2014 Mar 06, 2014 2DBP-03 WESTSIDE LIFT STATION 0.019 0.003
1Q2014 Mar 06, 2014 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.015 0.004
4Q2013 Dec 03, 2013 2DBP-01 IDSE #6 SEWAGE TREATMENT PLANT 0.008 0.003
4Q2013 Dec 03, 2013 2DBP-02 3 SNAKCORP 0.007 0.011
4Q2013 Dec 03, 2013 2DBP-03 WESTSIDE LIFT STATION 0.009 0.002
4Q2013 Dec 03, 2013 2DBP-04 NEAR SANDSTONE MIDDLE SCHOOL 0.007 0.002



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