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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 121–130 of 247 samples, newest first — collected March 23, 2015 to June 20, 2017. The summary above covers all 247.

50 results from the 10 samples listed here: 12 detected, 38 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.

Chemical and radiological sample results for Porterville W/A, every result from 121 to 130 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
Jun 20, 2017 10:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
170622-135PB
Laboratory
MSDH Lab
0.1592 mg/l , sample collected Jun 20, 2017 10:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 20, 2017 10:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2015 – Dec 31, 2017
Collected
Feb 22, 2017 14:58
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
170223-043NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 22, 2017 14:58, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 22, 2017 14:58, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 22, 2017 14:58, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Collected
Feb 22, 2017 14:16
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
170223-042NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 22, 2017 14:16, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 22, 2017 14:16, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 22, 2017 14:16, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Collected
Apr 12, 2016 14:25
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
160413-068NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 12, 2016 14:25, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 12, 2016 14:25, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 12, 2016 14:25, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Collected
Apr 12, 2016 14:04
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
160413-059NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 12, 2016 14:04, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 12, 2016 14:04, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 12, 2016 14:04, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Collected
Aug 19, 2015 02:48
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
150820-009TH
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 19, 2015 02:48, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
1.82 ug/l , sample collected Aug 19, 2015 02:48, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 19, 2015 02:48, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
1.19 ug/l , sample collected Aug 19, 2015 02:48, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
3.01 ug/l , sample collected Aug 19, 2015 02:48, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2014 – Dec 31, 2016
Collected
Aug 19, 2015 02:39
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
150820-009HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Aug 19, 2015 02:39, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 19, 2015 02:39, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 19, 2015 02:39, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 19, 2015 02:39, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
0.001 mg/l , sample collected Aug 19, 2015 02:39, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.001 mg/l , sample collected Aug 19, 2015 02:39, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2014 – Dec 31, 2016
Collected
Apr 13, 2015 01:20
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
150414-050IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 01:20, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.1318 mg/l , sample collected Apr 13, 2015 01:20, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 01:20, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0034 mg/l , sample collected Apr 13, 2015 01:20, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.724 mg/l , sample collected Apr 13, 2015 01:20, sampling point TF101 Fluoride 1025 EPA method 300.0 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 01:20, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 01:20, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 01:20, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 01:20, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 01:20, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 01:20, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Collected
Apr 13, 2015 12:58
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
150414-049IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 12:58, sampling point TF102 Arsenic 1005 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.127 mg/l , sample collected Apr 13, 2015 12:58, sampling point TF102 Barium 1010 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 12:58, sampling point TF102 Cadmium 1015 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0024 mg/l , sample collected Apr 13, 2015 12:58, sampling point TF102 Chromium 1020 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.297 mg/l , sample collected Apr 13, 2015 12:58, sampling point TF102 Fluoride 1025 EPA method 300.0 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 12:58, sampling point TF102 Mercury 1035 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 12:58, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 12:58, sampling point TF102 Selenium 1045 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 12:58, sampling point TF102 Antimony, Total 1074 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 12:58, sampling point TF102 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 13, 2015 12:58, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Collected
Mar 23, 2015 14:58
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
150324-022NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 23, 2015 14:58, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 23, 2015 14:58, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 23, 2015 14:58, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015

Routine (10).