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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

MS0230015 , Stennis Space Center

46 of the 76 analytes this system has been tested for have been detected at least once, across 848 samples on record.

The other 30 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 848 samples on record, detections range from August 11, 1992 to April 21, 2026. 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 Stennis Space Center, 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
Lead 1030 Inorganic Chemical 237 of 368 results Aug 11, 1992 Aug 12, 2024
Copper, Free 1022 Inorganic Chemical 233 of 368 results Aug 11, 1992 Aug 12, 2024
TTHM 2950 Organic Chemical 91 of 91 results May 26, 2004 Aug 12, 2025
Chloroform 2941 Organic Chemical 83 of 83 results Sep 6, 2006 Aug 12, 2025
Bromodichloromethane 2943 Organic Chemical 80 of 83 results Sep 6, 2006 Aug 12, 2025
Dibromochloromethane 2944 Organic Chemical 80 of 83 results Sep 6, 2006 Aug 12, 2025
Fluoride 1025 Inorganic Chemical 51 of 51 results Jun 25, 2002 Apr 9, 2025
Barium 1010 Inorganic Chemical 48 of 48 results Jun 25, 2002 Apr 9, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 37 of 37 results Aug 2, 2004 Apr 21, 2026
Dichloroacetic Acid 2451 Organic Chemical 28 of 28 results Jun 23, 2008 Apr 21, 2026
Trichloroacetic Acid 2452 Organic Chemical 28 of 28 results Jun 23, 2008 Apr 21, 2026
Chromium 1020 Inorganic Chemical 27 of 48 results Jun 25, 2002 Apr 9, 2025
Sodium 1052 Inorganic Chemical 15 of 15 results Jun 12, 2008 Jan 30, 2024
Nickel 1036 Inorganic Chemical 12 of 48 results Apr 7, 2008 Apr 9, 2025
Sulfate 1055 Inorganic Chemical 11 of 11 results Jun 25, 2002 Feb 18, 2010
Gross Alpha, Incl. Radon & U 4002 Radionuclide 7 of 8 results Mar 5, 2012 Jan 29, 2020
Dibromoacetic Acid 2454 Organic Chemical 6 of 28 results Sep 8, 2009 Jun 25, 2014
Gross Alpha Particle Activity 4109 Radionuclide 6 of 9 results Jun 19, 2012 Jan 15, 2013
Monochloroacetic Acid 2450 Organic Chemical 5 of 28 results Jun 9, 2009 Dec 7, 2009
Arsenic 1005 Inorganic Chemical 4 of 48 results Nov 28, 2011 Apr 9, 2025
Cyanide 1024 Inorganic Chemical 3 of 61 results Nov 28, 2011 Jul 10, 2023
Nitrate-Nitrite 1038 Inorganic Chemical 3 of 104 results Jun 2, 2008 Feb 2, 2011
Nitrate 1040 Inorganic Chemical 3 of 104 results Jun 2, 2008 Feb 2, 2011
Calcium 1016 Inorganic Chemical 3 of 3 results Jun 12, 2008 Feb 18, 2010
Chloride 1017 Inorganic Chemical 3 of 3 results Jun 12, 2008 Feb 18, 2010
Manganese 1032 Inorganic Chemical 3 of 3 results Jun 12, 2008 Feb 18, 2010
Potassium 1042 Inorganic Chemical 3 of 3 results Jun 12, 2008 Feb 18, 2010
Residue, Total, Filterable 1057 Water Quality 3 of 3 results Jun 12, 2008 Feb 18, 2010
Alkalinity, Caco3 Stability 1067 Water Quality 3 of 3 results Jun 12, 2008 Feb 18, 2010
Carbon Dioxide 1901 Water Quality 3 of 3 results Jun 12, 2008 Feb 18, 2010
Color 1905 Water Quality 3 of 3 results Jun 12, 2008 Feb 18, 2010
Hardness, Total (As Caco3) 1915 Water Quality 3 of 3 results Jun 12, 2008 Feb 18, 2010
PH 1925 Water Quality 3 of 3 results Jun 12, 2008 Feb 18, 2010
Alkalinity, Total 1927 Water Quality 3 of 3 results Jun 12, 2008 Feb 18, 2010
Calculated Sodium NACA Water Quality 3 of 3 results Jun 12, 2008 Feb 18, 2010
Carbon Tetrachloride 2982 Organic Chemical 2 of 77 results Jul 20, 2004 Mar 13, 2023
Radium-226 4020 Radionuclide 2 of 15 results Dec 8, 2015 Jan 29, 2020
Styrene 2996 Organic Chemical 2 of 77 results Sep 29, 2005 Jun 4, 2018
Nitrite 1041 Inorganic Chemical 2 of 104 results Aug 10, 2005 Feb 1, 2012
PH, Field Result PHFD Water Quality 2 of 2 results Jun 12, 2008 Jun 12, 2008
Cadmium 1015 Inorganic Chemical 2 of 48 results Mar 9, 2005 Mar 9, 2005
Selenium 1045 Inorganic Chemical 2 of 48 results Mar 9, 2005 Mar 9, 2005
Xylenes, Total 2955 Organic Chemical 1 of 77 results Jun 4, 2018 Jun 4, 2018
Combined Radium (-226 & -228) 4010 Radionuclide 1 of 15 results Dec 8, 2015 Dec 8, 2015
Iron 1028 Inorganic Chemical 1 of 3 results Feb 18, 2010 Feb 18, 2010
Magnesium 1031 Inorganic Chemical 1 of 3 results Feb 18, 2010 Feb 18, 2010

Showing samples collected between September 26, 2024 and September 26, 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 table below lists 1–10 of 23 samples, newest first — collected April 29, 2025 to July 6, 2026. The summary above covers all 23.

66 results from the 10 samples listed here: 10 detected, 56 not detected. Across the whole record it is 1,152 of 4,036. 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 Stennis Space Center, every result from 1 to 10 of 23 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
Jul 6, 2026
Sampling point
TF111 Treatment Facility TF111
Sample type
Routine
Lab sample
35048642002
Laboratory
Pace Analytical Services, LLC
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Cyanide 1024 EPA method 335.4 Jan 1, 2026 – Dec 31, 2031
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Dichloromethane 2964 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Benzene 2990 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Toluene 2991 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF111 Styrene 2996 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Collected
Jul 6, 2026
Sampling point
TF110 Treatment Facility TF110
Sample type
Routine
Lab sample
35048642001
Laboratory
Pace Analytical Services, LLC
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Cyanide 1024 EPA method 335.4 Jan 1, 2026 – Dec 31, 2031
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Dichloromethane 2964 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Benzene 2990 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Toluene 2991 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2026, sampling point TF110 Styrene 2996 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Collected
Jun 23, 2026
Sampling point
TF104
Sample type
Routine
Lab sample
35046146001
Laboratory
Pace Analytical Services, LLC
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Jun 23, 2026, sampling point TF104 Cyanide 1024 EPA method 335.4 Not recorded
Collected
Apr 21, 2026 09:30
Sampling point
SM1 Building 4400
Sample type
Routine
Lab sample
810-188984-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Apr 21, 2026 09:30, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
15 ug/l , sample collected Apr 21, 2026 09:30, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
19 ug/l , sample collected Apr 21, 2026 09:30, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Apr 21, 2026 09:30, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Apr 21, 2026 09:30, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
34 ug/l , sample collected Apr 21, 2026 09:30, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2026 – Dec 31, 2026
Collected
Sep 8, 2025 09:15
Sampling point
TF111 Treatment Facility TF111
Sample type
Routine
Lab sample
IN-250909-014
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 8, 2025 09:15, sampling point TF111 Mercury 1035 EPA method 200.8 Jan 1, 2025 – Dec 31, 2025
Collected
Sep 8, 2025 09:34
Sampling point
TF110 Treatment Facility TF110
Sample type
Routine
Lab sample
IN-250909-015
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 8, 2025 09:34, sampling point TF110 Mercury 1035 EPA method 200.8 Jan 1, 2025 – Dec 31, 2025
Collected
Aug 12, 2025 08:55
Sampling point
SM1 Building 4400
Sample type
Routine
Lab sample
810-159741-1
Laboratory
Eurofins Eaton Analytical South Bend in
45 ug/l , sample collected Aug 12, 2025 08:55, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 12, 2025 08:55, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
14 ug/l , sample collected Aug 12, 2025 08:55, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
4 ug/l , sample collected Aug 12, 2025 08:55, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
63 ug/l , sample collected Aug 12, 2025 08:55, sampling point SM1 TTHM 2950 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Collected
May 28, 2025 09:00
Sampling point
SM1 Building 4400
Sample type
Routine
Lab sample
810-150369-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected May 28, 2025 09:00, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
12 ug/l , sample collected May 28, 2025 09:00, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
13 ug/l , sample collected May 28, 2025 09:00, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 28, 2025 09:00, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 28, 2025 09:00, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
25 ug/l , sample collected May 28, 2025 09:00, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2025 – Dec 31, 2025
Collected
Apr 29, 2025 09:31
Sampling point
TF111 Treatment Facility TF111
Sample type
Routine
Lab sample
CN-250430-020
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Apr 29, 2025 09:31, sampling point TF111 Cyanide 1024 EPA method QC10204001X Jan 1, 2025 – Dec 31, 2025
Collected
Apr 29, 2025 09:58
Sampling point
TF110 Treatment Facility TF110
Sample type
Routine
Lab sample
CN-250430-019
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Apr 29, 2025 09:58, sampling point TF110 Cyanide 1024 EPA method QC10204001X Jan 1, 2025 – Dec 31, 2025

Routine (10).