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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

MS0570004 , City of McComb

25 of the 65 analytes this system has been tested for have been detected at least once, across 395 samples on record.

The other 40 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 395 samples on record, detections range from July 23, 2002 to August 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 City of McComb, 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 242 of 242 results Jun 10, 2004 Aug 19, 2025
Lead 1030 Inorganic Chemical 159 of 242 results Jun 10, 2004 Aug 19, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 20 of 46 results Aug 8, 2005 Nov 1, 2021
Fluoride 1025 Inorganic Chemical 11 of 11 results Jul 23, 2002 Mar 19, 2025
Monochloroacetic Acid 2450 Organic Chemical 11 of 30 results Jun 11, 2012 Jun 11, 2018
Barium 1010 Inorganic Chemical 10 of 10 results Jul 23, 2002 Mar 19, 2025
Arsenic 1005 Inorganic Chemical 9 of 10 results Mar 17, 2004 Mar 19, 2025
TTHM 2950 Organic Chemical 9 of 49 results Aug 4, 2004 Aug 19, 2010
Sodium 1052 Inorganic Chemical 3 of 3 results Oct 15, 2021 Feb 24, 2025
Sulfate 1055 Inorganic Chemical 3 of 3 results Jul 23, 2002 Oct 15, 2021
Chromium 1020 Inorganic Chemical 3 of 10 results Jul 23, 2002 Dec 12, 2016
Cadmium 1015 Inorganic Chemical 2 of 10 results Apr 11, 2005 May 8, 2013
Calcium 1016 Inorganic Chemical 1 of 1 result Oct 15, 2021 Oct 15, 2021
Chloride 1017 Inorganic Chemical 1 of 1 result Oct 15, 2021 Oct 15, 2021
Conductivity @ 25 C Umhos/CM 1064 Water Quality 1 of 1 result Oct 15, 2021 Oct 15, 2021
Alkalinity, Total 1927 Water Quality 1 of 1 result Oct 15, 2021 Oct 15, 2021
Gross Alpha, Incl. Radon & U 4002 Radionuclide 1 of 1 result Sep 17, 2019 Sep 17, 2019
Combined Radium (-226 & -228) 4010 Radionuclide 1 of 3 results Sep 17, 2019 Sep 17, 2019
Radium-226 4020 Radionuclide 1 of 3 results Sep 17, 2019 Sep 17, 2019
Radium-228 4030 Radionuclide 1 of 3 results Sep 17, 2019 Sep 17, 2019
Dichloroacetic Acid 2451 Organic Chemical 1 of 30 results Dec 1, 2016 Dec 1, 2016
Nickel 1036 Inorganic Chemical 1 of 10 results May 8, 2013 May 8, 2013
Monobromoacetic Acid 2453 Organic Chemical 1 of 30 results Sep 3, 2009 Sep 3, 2009
Selenium 1045 Inorganic Chemical 1 of 10 results Apr 11, 2005 Apr 11, 2005
Dichloromethane 2964 Organic Chemical 1 of 7 results Aug 24, 2004 Aug 24, 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 395 samples, newest first — collected October 3, 2022 to April 2, 2025. The summary above covers all 395.

36 results from the 10 samples listed here: 7 detected, 29 not detected. Across the whole record it is 495 of 1,234. 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 City of McComb, every result from 31 to 40 of 395 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 2, 2025 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NI-250403-008
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 2, 2025 13:00, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 2, 2025 13:00, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 2, 2025 13:00, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Mar 19, 2025 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
IN-250320-022
Laboratory
MSDH Lab
0.0036 mg/l , sample collected Mar 19, 2025 13:00, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0157 mg/l , sample collected Mar 19, 2025 13:00, sampling point TF080 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 19, 2025 13:00, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 19, 2025 13:00, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.131 mg/l , sample collected Mar 19, 2025 13:00, sampling point TF080 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 Mar 19, 2025 13:00, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 19, 2025 13:00, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Mar 19, 2025 13:00, sampling point TF080 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 19, 2025 13:00, sampling point TF080 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 Mar 19, 2025 13:00, sampling point TF080 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 Mar 19, 2025 13:00, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 24, 2025 14:06
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NA-250225-050
Laboratory
MSDH Lab
26 mg/l , sample collected Feb 24, 2025 14:06, sampling point TF080 Sodium 1052 EPA method 200.7 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 22, 2024 13:05
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
HA-240723-009
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 22, 2024 13:05, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Jul 22, 2024 13:00
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
TH-240723-009
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 22, 2024 13:00, sampling point SM1 TTHM 2950 EPA method 524.2 Not recorded
Collected
Apr 8, 2024 10:41
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NI-240409-022
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 8, 2024 10:41, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 8, 2024 10:41, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 8, 2024 10:41, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Collected
Aug 14, 2023 13:08
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
HA-230815-004
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 14, 2023 13:08, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Aug 14, 2023 13:08
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
TH-230815-004
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 14, 2023 13:08, sampling point SM1 TTHM 2950 EPA method 524.2 Not recorded
Collected
Mar 6, 2023 11:30
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NI-230307-007
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 6, 2023 11:30, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 6, 2023 11:30, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 6, 2023 11:30, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Collected
Oct 3, 2022 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
IN-221004-022
Laboratory
MSDH Lab
0.0034 mg/l , sample collected Oct 3, 2022 13:00, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0138 mg/l , sample collected Oct 3, 2022 13:00, sampling point TF080 Barium 1010 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 3, 2022 13:00, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 3, 2022 13:00, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.123 mg/l , sample collected Oct 3, 2022 13:00, sampling point TF080 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 3, 2022 13:00, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 3, 2022 13:00, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Oct 3, 2022 13:00, sampling point TF080 Selenium 1045 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 3, 2022 13:00, sampling point TF080 Antimony, Total 1074 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 3, 2022 13:00, sampling point TF080 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 3, 2022 13:00, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022

Routine (10).