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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 21–30 of 395 samples, newest first — collected June 17, 2025 to June 19, 2025. The summary above covers all 395.

20 results from the 10 samples listed here: 17 detected, 3 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 10 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 City of McComb, every result from 21 to 30 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
Jun 19, 2025 04:30
Sampling point
LC011 Location withheld
Sample type
Routine
Lab sample
PB-250701-054
Laboratory
MSDH Lab
0.255 mg/l , sample collected Jun 19, 2025 04:30, sampling point LC011 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.5 ug/l , sample collected Jun 19, 2025 04:30, sampling point LC011 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 19, 2025 07:30
Sampling point
LC029 Location withheld
Sample type
Routine
Lab sample
PB-250701-048
Laboratory
MSDH Lab
0.0373 mg/l , sample collected Jun 19, 2025 07:30, sampling point LC029 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
3.9 ug/l , sample collected Jun 19, 2025 07:30, sampling point LC029 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 18, 2025 06:00
Sampling point
LC034 Location withheld
Sample type
Routine
Lab sample
PB-250701-061
Laboratory
MSDH Lab
0.0728 mg/l , sample collected Jun 18, 2025 06:00, sampling point LC034 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 18, 2025 06:00, sampling point LC034 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 18, 2025 07:00
Sampling point
LC060 Location withheld
Sample type
Routine
Lab sample
PB-250701-056
Laboratory
MSDH Lab
0.215 mg/l , sample collected Jun 18, 2025 07:00, sampling point LC060 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 18, 2025 07:00, sampling point LC060 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 18, 2025 07:38
Sampling point
LC036 Location withheld
Sample type
Routine
Lab sample
PB-250701-044
Laboratory
MSDH Lab
0.624 mg/l , sample collected Jun 18, 2025 07:38, sampling point LC036 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.6 ug/l , sample collected Jun 18, 2025 07:38, sampling point LC036 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 18, 2025 08:00
Sampling point
LC053 Location withheld
Sample type
Routine
Lab sample
PB-250701-042
Laboratory
MSDH Lab
0.498 mg/l , sample collected Jun 18, 2025 08:00, sampling point LC053 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
1 ug/l , sample collected Jun 18, 2025 08:00, sampling point LC053 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 18, 2025 08:25
Sampling point
LC025 Location withheld
Sample type
Routine
Lab sample
PB-250701-046
Laboratory
MSDH Lab
0.642 mg/l , sample collected Jun 18, 2025 08:25, sampling point LC025 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.8 ug/l , sample collected Jun 18, 2025 08:25, sampling point LC025 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 18, 2025 10:00
Sampling point
LC030 Location withheld
Sample type
Routine
Lab sample
PB-250701-045
Laboratory
MSDH Lab
0.0237 mg/l , sample collected Jun 18, 2025 10:00, sampling point LC030 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
2.8 ug/l , sample collected Jun 18, 2025 10:00, sampling point LC030 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 17, 2025 08:13
Sampling point
LC018 Location withheld
Sample type
Routine
Lab sample
PB-250701-057
Laboratory
MSDH Lab
0.0013 mg/l , sample collected Jun 17, 2025 08:13, sampling point LC018 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 17, 2025 08:13, sampling point LC018 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 17, 2025 08:00
Sampling point
LC017 Location withheld
Sample type
Routine
Lab sample
PB-250701-050
Laboratory
MSDH Lab
0.468 mg/l , sample collected Jun 17, 2025 08:00, sampling point LC017 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
3.7 ug/l , sample collected Jun 17, 2025 08:00, sampling point LC017 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025

Routine (10).