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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

MS0300011 , Chevron Usa

23 of the 53 analytes this system has been tested for have been detected at least once, across 485 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 485 samples on record, detections range from September 22, 2003 to December 9, 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 Chevron Usa, 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 149 of 150 results Jun 29, 2004 Sep 30, 2024
TTHM 2950 Organic Chemical 130 of 130 results Sep 13, 2004 Dec 9, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 126 of 127 results Oct 7, 2005 Dec 9, 2025
Chloroform 2941 Organic Chemical 87 of 87 results Mar 14, 2007 Dec 14, 2020
Bromodichloromethane 2943 Organic Chemical 87 of 87 results Mar 14, 2007 Dec 14, 2020
Dibromochloromethane 2944 Organic Chemical 87 of 87 results Mar 14, 2007 Dec 14, 2020
Dichloroacetic Acid 2451 Organic Chemical 81 of 81 results Mar 19, 2008 Dec 14, 2020
Trichloroacetic Acid 2452 Organic Chemical 81 of 81 results Mar 19, 2008 Dec 14, 2020
Dibromoacetic Acid 2454 Organic Chemical 79 of 81 results Mar 19, 2008 Dec 14, 2020
Lead 1030 Inorganic Chemical 59 of 150 results Jun 29, 2004 Sep 30, 2024
Monochloroacetic Acid 2450 Organic Chemical 41 of 81 results Mar 19, 2008 Dec 14, 2020
Bromoform 2942 Organic Chemical 39 of 87 results May 2, 2007 Aug 19, 2020
Monobromoacetic Acid 2453 Organic Chemical 23 of 81 results Oct 30, 2008 Aug 19, 2020
Barium 1010 Inorganic Chemical 15 of 15 results Sep 22, 2003 Feb 12, 2025
Fluoride 1025 Inorganic Chemical 15 of 15 results Sep 22, 2003 Feb 12, 2025
Arsenic 1005 Inorganic Chemical 10 of 15 results Mar 16, 2005 Feb 12, 2025
Chromium 1020 Inorganic Chemical 10 of 15 results Sep 22, 2003 May 18, 2022
Selenium 1045 Inorganic Chemical 6 of 15 results Nov 15, 2004 Feb 8, 2006
Nickel 1036 Inorganic Chemical 2 of 15 results May 12, 2010 Nov 26, 2012
Sulfate 1055 Inorganic Chemical 2 of 2 results Sep 22, 2003 Sep 22, 2003
Sodium 1052 Inorganic Chemical 1 of 1 result Mar 22, 2021 Mar 22, 2021
Thallium, Total 1085 Inorganic Chemical 1 of 15 results May 12, 2010 May 12, 2010
Carbon Tetrachloride 2982 Organic Chemical 1 of 20 results Jun 19, 2007 Jun 19, 2007

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 33 samples, newest first — collected June 25, 2025 to December 9, 2025. The summary above covers all 33.

10 results from the 10 samples listed here: 9 detected, 1 not detected. Across the whole record it is 1,132 of 1,992. 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 Chevron Usa, every result from 1 to 10 of 33 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
Dec 9, 2025 13:00
Sampling point
SM2 Shipping Maintenance
Sample type
Routine
Lab sample
HA-251210-002
Laboratory
MSDH Lab
19.6 ug/l , sample collected Dec 9, 2025 13:00, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Dec 9, 2025 12:30
Sampling point
SM1 Utilities Control
Sample type
Routine
Lab sample
HA-251210-001
Laboratory
MSDH Lab
24.8 ug/l , sample collected Dec 9, 2025 12:30, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Dec 9, 2025 13:00
Sampling point
SM2 Shipping Maintenance
Sample type
Routine
Lab sample
TH-251210-002
Laboratory
MSDH Lab
63.4 ug/l , sample collected Dec 9, 2025 13:00, sampling point SM2 TTHM 2950 EPA method 524.2 Not recorded
Collected
Dec 9, 2025 12:30
Sampling point
SM1 Utilities Control
Sample type
Routine
Lab sample
TH-251210-001
Laboratory
MSDH Lab
64.2 ug/l , sample collected Dec 9, 2025 12:30, sampling point SM1 TTHM 2950 EPA method 524.2 Not recorded
Collected
Sep 24, 2025 14:00
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
CN-250925-003
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Sep 24, 2025 14:00, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Sep 24, 2025 13:30
Sampling point
SM2 Shipping Maintenance
Sample type
Routine
Lab sample
HA-250925-006
Laboratory
MSDH Lab
23.4 ug/l , sample collected Sep 24, 2025 13:30, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jul 1, 2025 – Sep 30, 2025
Collected
Sep 24, 2025 13:00
Sampling point
SM1 Utilities Control
Sample type
Routine
Lab sample
HA-250925-005
Laboratory
MSDH Lab
21.2 ug/l , sample collected Sep 24, 2025 13:00, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jul 1, 2025 – Sep 30, 2025
Collected
Sep 24, 2025 13:30
Sampling point
SM2 Shipping Maintenance
Sample type
Routine
Lab sample
TH-250925-006
Laboratory
MSDH Lab
91.8 ug/l , sample collected Sep 24, 2025 13:30, sampling point SM2 TTHM 2950 EPA method 524.2 Jul 1, 2025 – Sep 30, 2025
Collected
Sep 24, 2025 13:00
Sampling point
SM1 Utilities Control
Sample type
Routine
Lab sample
TH-250925-005
Laboratory
MSDH Lab
81.2 ug/l , sample collected Sep 24, 2025 13:00, sampling point SM1 TTHM 2950 EPA method 524.2 Jul 1, 2025 – Sep 30, 2025
Collected
Jun 25, 2025 14:00
Sampling point
SM2 Shipping Maintenance
Sample type
Routine
Lab sample
HA-250626-006
Laboratory
MSDH Lab
22.8 ug/l , sample collected Jun 25, 2025 14:00, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2025 – Jun 30, 2025

Routine (10).