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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 191–200 of 302 samples, newest first — collected October 19, 2011 to April 9, 2012. The summary above covers all 302.

38 results from the 10 samples listed here: 4 detected, 34 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.

Chemical and radiological sample results for Oak Grove Water Assn, every result from 191 to 200 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
Apr 9, 2012 12:40
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
120412-049IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2012 12:40, sampling point TF102 Arsenic 1005 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.00515 mg/l , sample collected Apr 9, 2012 12:40, sampling point TF102 Barium 1010 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2012 12:40, sampling point TF102 Cadmium 1015 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2012 12:40, sampling point TF102 Chromium 1020 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.259 mg/l , sample collected Apr 9, 2012 12:40, sampling point TF102 Fluoride 1025 EPA method 380-75WE Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2012 12:40, sampling point TF102 Mercury 1035 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2012 12:40, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Apr 9, 2012 12:40, sampling point TF102 Selenium 1045 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2012 12:40, sampling point TF102 Antimony, Total 1074 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2012 12:40, sampling point TF102 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2012 12:40, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Feb 13, 2012 10:37
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
120214-079NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 13, 2012 10:37, sampling point TF101 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 13, 2012 10:37, sampling point TF101 Nitrate 1040 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 13, 2012 10:37, sampling point TF101 Nitrite 1041 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Collected
Feb 13, 2012 10:38
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
120214-078NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 13, 2012 10:38, sampling point TF102 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 13, 2012 10:38, sampling point TF102 Nitrate 1040 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 13, 2012 10:38, sampling point TF102 Nitrite 1041 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Collected
Feb 6, 2012 15:20
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
120207-060
Laboratory
Radiation Safety Engineering
0.5 pci/l , sample collected Feb 6, 2012 15:20, sampling point TF101 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.39 pci/l Minimum Reporting Level , sample collected Feb 6, 2012 15:20, sampling point TF101 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.247 pci/l Minimum Reporting Level , sample collected Feb 6, 2012 15:20, sampling point TF101 Radium-226 4020 EPA method 903.1 Jan 1, 2012 – Mar 31, 2012
Not detected below 0.39 pci/l Minimum Reporting Level , sample collected Feb 6, 2012 15:20, sampling point TF101 Radium-228 4030 EPA method 904.0 Jan 1, 2012 – Mar 31, 2012
Collected
Feb 6, 2012 14:23
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
120207-061
Laboratory
Radiation Safety Engineering
Not detected below 0.43 pci/l Minimum Reporting Level , sample collected Feb 6, 2012 14:23, sampling point TF102 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.37 pci/l Minimum Reporting Level , sample collected Feb 6, 2012 14:23, sampling point TF102 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.185 pci/l Minimum Reporting Level , sample collected Feb 6, 2012 14:23, sampling point TF102 Radium-226 4020 EPA method 903.1 Jan 1, 2012 – Mar 31, 2012
Not detected below 0.37 pci/l Minimum Reporting Level , sample collected Feb 6, 2012 14:23, sampling point TF102 Radium-228 4030 EPA method 904.0 Jan 1, 2012 – Mar 31, 2012
Collected
Feb 6, 2012 14:24
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
120207-061RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 6, 2012 14:24, sampling point TF102 Combined Uranium 4006 EPA method 200.8 Jan 1, 2012 – Mar 31, 2012
Collected
Feb 6, 2012 15:21
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
120207-060RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 6, 2012 15:21, sampling point TF101 Combined Uranium 4006 EPA method 200.8 Jan 1, 2012 – Mar 31, 2012
Collected
Dec 15, 2011 11:39
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
111216-027
Laboratory
Radiation Safety Engineering
0.5 pci/l , sample collected Dec 15, 2011 11:39, sampling point TF101 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.39 pci/l Minimum Reporting Level , sample collected Dec 15, 2011 11:39, sampling point TF101 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.247 pci/l Minimum Reporting Level , sample collected Dec 15, 2011 11:39, sampling point TF101 Radium-226 4020 EPA method 903.1 Oct 1, 2011 – Dec 31, 2011
Not detected below 0.39 pci/l Minimum Reporting Level , sample collected Dec 15, 2011 11:39, sampling point TF101 Radium-228 4030 EPA method 904.0 Oct 1, 2011 – Dec 31, 2011
Collected
Dec 15, 2011 11:44
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
111216-028
Laboratory
Radiation Safety Engineering
Not detected below 0.43 pci/l Minimum Reporting Level , sample collected Dec 15, 2011 11:44, sampling point TF102 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.37 pci/l Minimum Reporting Level , sample collected Dec 15, 2011 11:44, sampling point TF102 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.185 pci/l Minimum Reporting Level , sample collected Dec 15, 2011 11:44, sampling point TF102 Radium-226 4020 EPA method 903.1 Oct 1, 2011 – Dec 31, 2011
Not detected below 0.37 pci/l Minimum Reporting Level , sample collected Dec 15, 2011 11:44, sampling point TF102 Radium-228 4030 EPA method 904.0 Oct 1, 2011 – Dec 31, 2011
Collected
Oct 19, 2011 01:08
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
111020-012NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Oct 19, 2011 01:08, sampling point TF101 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2011 – Dec 31, 2011
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Oct 19, 2011 01:08, sampling point TF101 Nitrate 1040 EPA method 353.2 Jan 1, 2011 – Dec 31, 2011
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Oct 19, 2011 01:08, sampling point TF101 Nitrite 1041 EPA method 353.2 Jan 1, 2011 – Dec 31, 2011

Routine (10).