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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

MS0110011 , Entergy Operations, Inc

22 of the 53 analytes this system has been tested for have been detected at least once, across 237 samples on record.

The other 31 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 237 samples on record, detections range from July 7, 1993 to January 28, 2026. 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 Entergy Operations, Inc, 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 153 of 154 results Jul 7, 1993 Jul 6, 2022
Lead 1030 Inorganic Chemical 89 of 154 results Jul 7, 1993 Jul 10, 2019
Nitrate-Nitrite 1038 Inorganic Chemical 23 of 23 results May 3, 2004 Jan 28, 2026
Nitrate 1040 Inorganic Chemical 23 of 23 results May 3, 2004 Jan 28, 2026
TTHM 2950 Organic Chemical 12 of 13 results May 10, 2004 Dec 15, 2025
Barium 1010 Inorganic Chemical 11 of 11 results Mar 12, 2002 Mar 11, 2025
Chromium 1020 Inorganic Chemical 11 of 11 results Mar 12, 2002 Mar 11, 2025
Fluoride 1025 Inorganic Chemical 11 of 11 results Mar 12, 2002 Mar 11, 2025
Arsenic 1005 Inorganic Chemical 10 of 11 results Jan 26, 2004 Mar 11, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 9 of 12 results Jun 4, 2007 Mar 13, 2025
Nickel 1036 Inorganic Chemical 9 of 11 results Mar 12, 2002 Mar 11, 2025
Chloroform 2941 Organic Chemical 6 of 7 results Sep 13, 2006 Dec 15, 2025
Bromoform 2942 Organic Chemical 6 of 7 results Sep 13, 2006 Dec 15, 2025
Bromodichloromethane 2943 Organic Chemical 6 of 7 results Sep 13, 2006 Dec 15, 2025
Dibromochloromethane 2944 Organic Chemical 6 of 7 results Sep 13, 2006 Dec 15, 2025
Selenium 1045 Inorganic Chemical 5 of 11 results Jan 26, 2004 Apr 21, 2014
Dichloroacetic Acid 2451 Organic Chemical 3 of 5 results Jul 12, 2012 Aug 18, 2014
Dibromoacetic Acid 2454 Organic Chemical 3 of 5 results Jul 12, 2012 Aug 18, 2014
Sulfate 1055 Inorganic Chemical 2 of 2 results Mar 12, 2002 Jan 26, 2004
Sodium 1052 Inorganic Chemical 1 of 1 result Feb 3, 2021 Feb 3, 2021
Monochloroacetic Acid 2450 Organic Chemical 1 of 5 results Jul 16, 2018 Jul 16, 2018
Uranium-238 4009 Radionuclide 1 of 1 result Jan 23, 2006 Jan 23, 2006

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 237 samples, newest first — collected January 10, 1994 to January 10, 1994. The summary above covers all 237.

20 results from the 10 samples listed here: 15 detected, 5 not detected. Across the whole record it is 401 of 842. 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 Entergy Operations, Inc, every result from 191 to 200 of 237 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
Jan 10, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940111-220L
Laboratory
MSDH Lab
1.441 mg/l , sample collected Jan 10, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.003 mg/l , sample collected Jan 10, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Jan 10, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940111-219L
Laboratory
MSDH Lab
0.761 mg/l , sample collected Jan 10, 1994, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Jan 10, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Jan 10, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940111-218L
Laboratory
MSDH Lab
0.809 mg/l , sample collected Jan 10, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.003 mg/l , sample collected Jan 10, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Jan 10, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940111-217L
Laboratory
MSDH Lab
0.219 mg/l , sample collected Jan 10, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.003 mg/l , sample collected Jan 10, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Jan 10, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940111-216L
Laboratory
MSDH Lab
0.508 mg/l , sample collected Jan 10, 1994, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Jan 10, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Jan 10, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940111-215L
Laboratory
MSDH Lab
0.392 mg/l , sample collected Jan 10, 1994, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Jan 10, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Jan 10, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940111-214L
Laboratory
MSDH Lab
0.538 mg/l , sample collected Jan 10, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.002 mg/l , sample collected Jan 10, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Jan 10, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940111-213L
Laboratory
MSDH Lab
0.777 mg/l , sample collected Jan 10, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.004 mg/l , sample collected Jan 10, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Jan 10, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940111-212L
Laboratory
MSDH Lab
1.319 mg/l , sample collected Jan 10, 1994, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Jan 10, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Jan 10, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940111-211L
Laboratory
MSDH Lab
1.131 mg/l , sample collected Jan 10, 1994, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Jan 10, 1994, sampling point DS000 Lead 1030 Not recorded

Routine (10).