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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

MS0350006 , Porterville W/A

21 of the 57 analytes this system has been tested for have been detected at least once, across 247 samples on record.

The other 36 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 247 samples on record, detections range from September 24, 2003 to November 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 Porterville W/A, 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 60 of 60 results Aug 1, 2007 Aug 23, 2023
Lead 1030 Inorganic Chemical 32 of 60 results Aug 1, 2007 Aug 23, 2023
Barium 1010 Inorganic Chemical 28 of 28 results Sep 24, 2003 Nov 19, 2025
Fluoride 1025 Inorganic Chemical 27 of 27 results Sep 24, 2003 Apr 9, 2025
Arsenic 1005 Inorganic Chemical 24 of 28 results Feb 23, 2004 Nov 19, 2025
Chromium 1020 Inorganic Chemical 21 of 28 results Sep 24, 2003 Nov 19, 2025
TTHM 2950 Organic Chemical 16 of 19 results Jun 21, 2004 Nov 20, 2024
Selenium 1045 Inorganic Chemical 14 of 28 results Feb 23, 2004 Apr 9, 2025
Bromoform 2942 Organic Chemical 13 of 16 results Aug 13, 2007 Nov 20, 2024
Nickel 1036 Inorganic Chemical 11 of 28 results Feb 23, 2004 Nov 19, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 10 of 10 results Mar 5, 2012 Oct 2, 2012
Dibromochloromethane 2944 Organic Chemical 8 of 16 results Aug 19, 2015 Nov 20, 2024
Sodium 1052 Inorganic Chemical 7 of 7 results Sep 23, 2019 Feb 5, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 3 of 17 results Sep 23, 2009 Jun 15, 2020
Bromodichloromethane 2943 Organic Chemical 2 of 16 results Aug 21, 2024 Aug 21, 2024
Dibromoacetic Acid 2454 Organic Chemical 2 of 14 results Aug 19, 2015 Jun 15, 2020
Nitrate-Nitrite 1038 Inorganic Chemical 2 of 53 results Feb 21, 2018 Feb 21, 2018
Nitrate 1040 Inorganic Chemical 2 of 53 results Feb 21, 2018 Feb 21, 2018
Thallium, Total 1085 Inorganic Chemical 2 of 28 results Feb 13, 2006 Feb 13, 2006
Monobromoacetic Acid 2453 Organic Chemical 1 of 14 results Jun 15, 2020 Jun 15, 2020
Dichloromethane 2964 Organic Chemical 1 of 23 results Aug 2, 2004 Aug 2, 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 61–70 of 247 samples, newest first — collected June 12, 2023 to August 23, 2023. The summary above covers all 247.

45 results from the 10 samples listed here: 13 detected, 32 not detected. Across the whole record it is 286 of 1,329. 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 4 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 Porterville W/A, every result from 61 to 70 of 247 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
Aug 23, 2023 06:00
Sampling point
LC0030 Location withheld
Sample type
Routine
Lab sample
PB-230824-106
Laboratory
MSDH Lab
0.12 mg/l , sample collected Aug 23, 2023 06:00, sampling point LC0030 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 23, 2023 06:00, sampling point LC0030 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 23, 2023 06:30
Sampling point
LC0019 Location withheld
Sample type
Routine
Lab sample
PB-230824-107
Laboratory
MSDH Lab
0.0389 mg/l , sample collected Aug 23, 2023 06:30, sampling point LC0019 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 23, 2023 06:30, sampling point LC0019 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 23, 2023 17:54
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-230824-109
Laboratory
MSDH Lab
0.0974 mg/l , sample collected Aug 23, 2023 17:54, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 23, 2023 17:54, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 23, 2023 07:00
Sampling point
LC0012 Location withheld
Sample type
Routine
Lab sample
PB-230824-100
Laboratory
MSDH Lab
0.0448 mg/l , sample collected Aug 23, 2023 07:00, sampling point LC0012 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.521 ug/l , sample collected Aug 23, 2023 07:00, sampling point LC0012 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 23, 2023 05:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-230824-108
Laboratory
MSDH Lab
0.557 mg/l , sample collected Aug 23, 2023 05:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 23, 2023 05:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 2, 2023 13:45
Sampling point
TF103 Treatment Facility TF103
Sample type
Routine
Lab sample
VO-230803-018
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Xylenes, Total 2955 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Dichloromethane 2964 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 O-Dichlorobenzene 2968 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 P-Dichlorobenzene 2969 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Vinyl Chloride 2976 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 1,1-Dichloroethylene 2977 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 1,2-Dichloroethane 2980 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 1,1,1-Trichloroethane 2981 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Carbon Tetrachloride 2982 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 1,2-Dichloropropane 2983 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Trichloroethylene 2984 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 1,1,2-Trichloroethane 2985 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Tetrachloroethylene 2987 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Chlorobenzene 2989 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Benzene 2990 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Toluene 2991 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Ethylbenzene 2992 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2023 13:45, sampling point TF103 Styrene 2996 EPA method 524.2 Jul 1, 2023 – Sep 30, 2023
Collected
Jul 10, 2023 13:27
Sampling point
TF103 Treatment Facility TF103
Sample type
Routine
Lab sample
CN-230711-023
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jul 10, 2023 13:27, sampling point TF103 Cyanide 1024 EPA method QC10204001X Jul 1, 2023 – Sep 30, 2023
Collected
Jul 10, 2023 14:15
Sampling point
TF103 Treatment Facility TF103
Sample type
Routine
Lab sample
IN-230711-005
Laboratory
MSDH Lab
0.0058 mg/l , sample collected Jul 10, 2023 14:15, sampling point TF103 Arsenic 1005 EPA method 200.8 Jul 1, 2023 – Sep 30, 2023
0.13 mg/l , sample collected Jul 10, 2023 14:15, sampling point TF103 Barium 1010 EPA method 200.8 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 10, 2023 14:15, sampling point TF103 Cadmium 1015 EPA method 200.8 Jul 1, 2023 – Sep 30, 2023
0.0012 mg/l , sample collected Jul 10, 2023 14:15, sampling point TF103 Chromium 1020 EPA method 200.8 Jul 1, 2023 – Sep 30, 2023
1.06 mg/l , sample collected Jul 10, 2023 14:15, sampling point TF103 Fluoride 1025 EPA method QC 10-109-12-2-A Jul 1, 2023 – Sep 30, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 10, 2023 14:15, sampling point TF103 Mercury 1035 EPA method 200.8 Jul 1, 2023 – Sep 30, 2023
0.0007 mg/l , sample collected Jul 10, 2023 14:15, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
0.004 mg/l , sample collected Jul 10, 2023 14:15, sampling point TF103 Selenium 1045 EPA method 200.8 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 10, 2023 14:15, sampling point TF103 Antimony, Total 1074 EPA method 200.8 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 10, 2023 14:15, sampling point TF103 Beryllium, Total 1075 EPA method 200.8 Jul 1, 2023 – Sep 30, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 10, 2023 14:15, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jul 1, 2023 – Sep 30, 2023
Collected
Jun 12, 2023 13:15
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-230613-001
Laboratory
MSDH Lab
1.63 ug/l , sample collected Jun 12, 2023 13:15, sampling point MRT000 TTHM 2950 EPA method 524.2 Not recorded
Collected
Jun 12, 2023 13:57
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-230613-001
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 12, 2023 13:57, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded

Routine (10).