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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

MS0270024 , Humphreys Co-Tchula Lake #7

22 of the 58 analytes this system has been tested for have been detected at least once, across 185 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 185 samples on record, detections range from July 28, 1993 to February 10, 2025. These figures cover the whole record; the list of samples further down is narrowed.

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 Humphreys Co-Tchula Lake #7, 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 92 of 112 results Jul 28, 1993 Aug 29, 2024
Lead 1030 Inorganic Chemical 48 of 112 results Jul 28, 1993 Aug 29, 2024
Barium 1010 Inorganic Chemical 10 of 10 results Sep 17, 2003 Feb 10, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 6 of 8 results Aug 16, 2007 Feb 10, 2025
TTHM 2950 Organic Chemical 6 of 7 results Aug 16, 2007 Feb 10, 2025
Fluoride 1025 Inorganic Chemical 6 of 10 results Sep 17, 2003 Mar 2, 2016
Dichloroacetic Acid 2451 Organic Chemical 4 of 4 results Sep 16, 2008 Aug 6, 2018
Trichloroacetic Acid 2452 Organic Chemical 4 of 4 results Sep 16, 2008 Aug 6, 2018
Chloroform 2941 Organic Chemical 4 of 4 results Aug 16, 2007 Sep 24, 2014
Bromodichloromethane 2943 Organic Chemical 4 of 4 results Aug 16, 2007 Sep 24, 2014
Sodium 1052 Inorganic Chemical 3 of 3 results Sep 23, 2019 Feb 7, 2024
Chromium 1020 Inorganic Chemical 3 of 10 results Feb 9, 2004 Mar 2, 2016
Gross Alpha Particle Activity 4109 Radionuclide 2 of 4 results Jun 28, 2012 Sep 10, 2012
Selenium 1045 Inorganic Chemical 2 of 10 results Mar 16, 2005 Feb 27, 2006
Sulfate 1055 Inorganic Chemical 2 of 2 results Sep 17, 2003 Feb 9, 2004
Monobromoacetic Acid 2453 Organic Chemical 1 of 4 results Sep 24, 2014 Sep 24, 2014
Combined Radium (-226 & -228) 4010 Radionuclide 1 of 2 results Dec 5, 2011 Dec 5, 2011
Radium-228 4030 Radionuclide 1 of 2 results Dec 5, 2011 Dec 5, 2011
Nickel 1036 Inorganic Chemical 1 of 10 results Apr 16, 2008 Apr 16, 2008
Nitrite 1041 Inorganic Chemical 1 of 22 results Apr 23, 2007 Apr 23, 2007
Cadmium 1015 Inorganic Chemical 1 of 10 results Mar 16, 2005 Mar 16, 2005
Cyanide 1024 Inorganic Chemical 1 of 10 results Feb 9, 2004 Feb 9, 2004

Showing samples collected between September 25, 2024 and September 25, 2026. That is this page’s default, not a limit on what the agency records.

Show every sample on record

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The most recent samples, result by result

The 5 samples collected between September 25, 2024 and September 25, 2026 are listed below, newest first.

17 results from the 5 samples listed here: 3 detected, 14 not detected. 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 1 sampling point 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 Humphreys Co-Tchula Lake #7, every result from the 5 samples on record, 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
Sep 10, 2025 14:00
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
CN-250911-005
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Sep 10, 2025 14:00, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Feb 10, 2025 08:30
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
IN-250211-050
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 08:30, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0062 mg/l , sample collected Feb 10, 2025 08:30, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 08:30, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 08:30, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 08:30, sampling point TF101 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 08:30, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 08:30, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 08:30, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 08:30, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 08:30, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 08:30, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 10, 2025 10:30
Sampling point
SMD Location withheld
Sample type
Routine
Lab sample
HA-250211-015
Laboratory
MSDH Lab
17.6 ug/l , sample collected Feb 10, 2025 10:30, sampling point SMD Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 10, 2025 10:25
Sampling point
SMD Location withheld
Sample type
Routine
Lab sample
TH-250211-015
Laboratory
MSDH Lab
1.21 ug/l , sample collected Feb 10, 2025 10:25, sampling point SMD TTHM 2950 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 10, 2025 09:45
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NI-250211-026
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 09:45, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 09:45, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 09:45, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025

Routine (5).