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This is a rebuild of Drinking Water Watch and not yet the official record. Use the agency’s current Drinking Water Watch for anything you need to rely on.

Chemical and radiological sample results

MS0340011 , Oak Grove Water Assn

22 of the 58 analytes this system has been tested for have been detected at least once, across 302 samples on record.

The other 36 were tested for and never found. An analyte is counted here if any result on record measured it, so this covers the whole history and not the samples listed below.

Across all 302 samples on record, detections range from September 24, 2003 to November 19, 2025. These figures cover the whole record.

What counts as a non-detect is defined in the help: Less than Indicator. This system’s violations.

What has been detected, ever

Every analyte measured above its reporting level at any point in this system’s record, most often detected first. This is not limited to the samples listed below.

Every analyte ever detected for Oak Grove Water Assn, with how many results found it and when it was first and last detected. Covers the whole record, not only the samples listed below.
Analyte Kind Detected in First detected Last detected
Copper, Free 1022 Inorganic Chemical 61 of 61 results Jul 24, 2007 Aug 22, 2023
Lead 1030 Inorganic Chemical 42 of 61 results Jul 24, 2007 Aug 22, 2023
Barium 1010 Inorganic Chemical 24 of 24 results Sep 24, 2003 Feb 24, 2025
Fluoride 1025 Inorganic Chemical 24 of 24 results Sep 24, 2003 Feb 24, 2025
TTHM 2950 Organic Chemical 22 of 22 results Jun 16, 2004 Oct 13, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 20 of 21 results Aug 16, 2007 Nov 19, 2025
Chloroform 2941 Organic Chemical 17 of 17 results Aug 16, 2007 Oct 13, 2025
Bromodichloromethane 2943 Organic Chemical 17 of 17 results Aug 16, 2007 Oct 13, 2025
Dichloroacetic Acid 2451 Organic Chemical 15 of 15 results Sep 21, 2009 Nov 19, 2025
Trichloroacetic Acid 2452 Organic Chemical 15 of 15 results Sep 21, 2009 Nov 19, 2025
Dibromochloromethane 2944 Organic Chemical 12 of 17 results Sep 21, 2009 Oct 13, 2025
Sodium 1052 Inorganic Chemical 9 of 9 results Sep 18, 2019 Feb 3, 2025
Nickel 1036 Inorganic Chemical 8 of 24 results Feb 13, 2006 Feb 24, 2025
Chromium 1020 Inorganic Chemical 7 of 24 results Sep 24, 2003 May 30, 2017
Gross Alpha, Incl. Radon & U 4002 Radionuclide 6 of 11 results Dec 15, 2011 Dec 2, 2013
Xylenes, Total 2955 Organic Chemical 5 of 66 results Feb 2, 2004 May 31, 2005
Sulfate 1055 Inorganic Chemical 4 of 4 results Sep 24, 2003 Feb 25, 2004
Ethylbenzene 2992 Organic Chemical 2 of 66 results Feb 2, 2004 Feb 2, 2004
Monobromoacetic Acid 2453 Organic Chemical 1 of 15 results Sep 8, 2020 Sep 8, 2020
Monochloroacetic Acid 2450 Organic Chemical 1 of 15 results Jul 1, 2015 Jul 1, 2015
Arsenic 1005 Inorganic Chemical 1 of 24 results Apr 2, 2014 Apr 2, 2014
Dichloromethane 2964 Organic Chemical 1 of 66 results Aug 4, 2004 Aug 4, 2004

No date range is applied: this list draws on every sample on record. Show the last two years only.

The most recent samples, result by result

The table below lists 31–40 of 302 samples, newest first — collected August 22, 2023 to August 22, 2023. The summary above covers all 302.

20 results from the 10 samples listed here: 15 detected, 5 not detected. Across the whole record it is 314 of 2,230. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

We withheld the location of 9 sampling points below. The location on record identifies a private home, and we do not publish those. That is our decision, not the agency’s. The sampling point, its type and every result taken there are published unchanged.

Chemical and radiological sample results for Oak Grove Water Assn, every result from 31 to 40 of 302 samples shown, newest first. Not detected means the amount was below the level the laboratory can reliably report, which is given beside it.
Result Analyte Monitoring period
Collected
Aug 22, 2023 07:00
Sampling point
LC0020 Location withheld
Sample type
Routine
Lab sample
PB-230823-121
Laboratory
MSDH Lab
0.11 mg/l , sample collected Aug 22, 2023 07:00, sampling point LC0020 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 22, 2023 07:00, sampling point LC0020 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 22, 2023 06:00
Sampling point
LC0021 Location withheld
Sample type
Routine
Lab sample
PB-230823-120
Laboratory
MSDH Lab
0.14 mg/l , sample collected Aug 22, 2023 06:00, sampling point LC0021 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 22, 2023 06:00, sampling point LC0021 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 22, 2023 05:15
Sampling point
LC0005 Location withheld
Sample type
Routine
Lab sample
PB-230823-119
Laboratory
MSDH Lab
0.1 mg/l , sample collected Aug 22, 2023 05:15, sampling point LC0005 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.9 ug/l , sample collected Aug 22, 2023 05:15, sampling point LC0005 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 22, 2023 06:30
Sampling point
LC0022 Location withheld
Sample type
Routine
Lab sample
PB-230823-118
Laboratory
MSDH Lab
0.113 mg/l , sample collected Aug 22, 2023 06:30, sampling point LC0022 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.9 ug/l , sample collected Aug 22, 2023 06:30, sampling point LC0022 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 22, 2023 06:48
Sampling point
LC0014 Location withheld
Sample type
Routine
Lab sample
PB-230823-117
Laboratory
MSDH Lab
0.141 mg/l , sample collected Aug 22, 2023 06:48, sampling point LC0014 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 22, 2023 06:48, sampling point LC0014 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 22, 2023 06:15
Sampling point
LC0016 Location withheld
Sample type
Routine
Lab sample
PB-230823-116
Laboratory
MSDH Lab
0.0535 mg/l , sample collected Aug 22, 2023 06:15, sampling point LC0016 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.9 ug/l , sample collected Aug 22, 2023 06:15, sampling point LC0016 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 22, 2023 05:00
Sampling point
LC0012 Location withheld
Sample type
Routine
Lab sample
PB-230823-115
Laboratory
MSDH Lab
0.101 mg/l , sample collected Aug 22, 2023 05:00, sampling point LC0012 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 22, 2023 05:00, sampling point LC0012 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 22, 2023 06:11
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-230823-114
Laboratory
MSDH Lab
0.0706 mg/l , sample collected Aug 22, 2023 06:11, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.6 ug/l , sample collected Aug 22, 2023 06:11, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 22, 2023 05:30
Sampling point
LC0026 Location withheld
Sample type
Routine
Lab sample
PB-230823-113
Laboratory
MSDH Lab
0.0733 mg/l , sample collected Aug 22, 2023 05:30, sampling point LC0026 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 22, 2023 05:30, sampling point LC0026 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 22, 2023 04:15
Sampling point
LC0017 Location withheld
Sample type
Routine
Lab sample
PB-230823-112
Laboratory
MSDH Lab
0.0471 mg/l , sample collected Aug 22, 2023 04:15, sampling point LC0017 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.8 ug/l , sample collected Aug 22, 2023 04:15, sampling point LC0017 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023

Routine (10).