Chemical and radiological sample results

MS0450024 , PRVWSD-Twin Harbor

28 of the 56 analytes this system has been tested for have been detected at least once, across 310 samples on record.

The other 28 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 310 samples on record, detections range from October 6, 2003 to November 20, 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 PRVWSD-Twin Harbor, 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	135 of 135 results	Jun 29, 2004	Aug 20, 2024
Lead 1030	Inorganic Chemical	67 of 135 results	Jun 29, 2004	Aug 20, 2024
TTHM 2950	Organic Chemical	21 of 21 results	Jul 12, 2004	Nov 20, 2025
Total Haloacetic Acids (Haa5) 2456	Organic Chemical	20 of 21 results	Aug 22, 2007	Nov 20, 2025
Barium 1010	Inorganic Chemical	17 of 17 results	Oct 6, 2003	Mar 11, 2025
Chloroform 2941	Organic Chemical	16 of 16 results	Aug 22, 2007	Nov 20, 2025
Bromodichloromethane 2943	Organic Chemical	16 of 16 results	Aug 22, 2007	Nov 20, 2025
Fluoride 1025	Inorganic Chemical	16 of 17 results	Oct 6, 2003	Mar 11, 2025
Dichloroacetic Acid 2451	Organic Chemical	14 of 15 results	Sep 28, 2009	Nov 20, 2025
Trichloroacetic Acid 2452	Organic Chemical	14 of 15 results	Sep 28, 2009	Nov 20, 2025
Dibromochloromethane 2944	Organic Chemical	11 of 16 results	Aug 7, 2013	Nov 14, 2024
Xylenes, Total 2955	Organic Chemical	7 of 33 results	Mar 29, 2004	Aug 15, 2007
Sodium 1052	Inorganic Chemical	6 of 6 results	Sep 16, 2019	Feb 24, 2025
Ethylbenzene 2992	Organic Chemical	6 of 33 results	Mar 29, 2004	May 30, 2007
Chromium 1020	Inorganic Chemical	5 of 17 results	Oct 6, 2003	Feb 3, 2010
Toluene 2991	Organic Chemical	5 of 33 results	Mar 29, 2004	May 11, 2006
Cadmium 1015	Inorganic Chemical	3 of 17 results	Mar 8, 2004	Apr 11, 2005
Combined Radium (-226 & -228) 4010	Radionuclide	2 of 12 results	Jun 12, 2018	Sep 12, 2019
Radium-226 4020	Radionuclide	2 of 12 results	Jun 12, 2018	Sep 12, 2019
Radium-228 4030	Radionuclide	2 of 12 results	Jun 12, 2018	Sep 12, 2019
Nitrate 1040	Inorganic Chemical	2 of 44 results	Jul 24, 2006	Jul 24, 2006
Selenium 1045	Inorganic Chemical	2 of 17 results	Apr 11, 2005	Apr 11, 2005
Sulfate 1055	Inorganic Chemical	2 of 2 results	Oct 6, 2003	Mar 8, 2004
Monobromoacetic Acid 2453	Organic Chemical	1 of 15 results	Sep 14, 2020	Sep 14, 2020
Dibromoacetic Acid 2454	Organic Chemical	1 of 15 results	Sep 18, 2018	Sep 18, 2018
Bromoform 2942	Organic Chemical	1 of 16 results	Sep 18, 2018	Sep 18, 2018
Nitrate-Nitrite 1038	Inorganic Chemical	1 of 44 results	Jul 24, 2006	Jul 24, 2006
Nickel 1036	Inorganic Chemical	1 of 17 results	Mar 8, 2004	Mar 8, 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 41–50 of 310 samples, newest first — collected September 20, 2021 to June 28, 2022. The summary above covers all 310.

34 results from the 10 samples listed here: 5 detected, 29 not detected. Across the whole record it is 396 of 1,546. 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 PRVWSD-Twin Harbor, every result from 41 to 50 of 310 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 28, 2022 07:48 Sampling point TF102 Treatment Plant T102 Sample type Routine Lab sample VO-220629-006 Laboratory MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	1,2,4-Trichlorobenzene 2378 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Cis-1,2-Dichloroethylene 2380 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Xylenes, Total 2955 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Dichloromethane 2964 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	O-Dichlorobenzene 2968 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	P-Dichlorobenzene 2969 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Vinyl Chloride 2976 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	1,1-Dichloroethylene 2977 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Trans-1,2-Dichloroethylene 2979 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	1,2-Dichloroethane 2980 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	1,1,1-Trichloroethane 2981 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Carbon Tetrachloride 2982 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	1,2-Dichloropropane 2983 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Trichloroethylene 2984 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	1,1,2-Trichloroethane 2985 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Tetrachloroethylene 2987 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Chlorobenzene 2989 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Benzene 2990 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Toluene 2991 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Ethylbenzene 2992 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 28, 2022 07:48, sampling point TF102	Styrene 2996 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Collected May 23, 2022 08:15 Sampling point MRT000 Max. Res. Time Sample type Routine Lab sample HA-220524-001 Laboratory MSDH Lab
35.2 ug/l , sample collected May 23, 2022 08:15, sampling point MRT000	Total Haloacetic Acids (Haa5) 2456 EPA method 552.2	Not recorded
Collected May 23, 2022 08:10 Sampling point MRT000 Max. Res. Time Sample type Routine Lab sample TH-220524-001 Laboratory MSDH Lab
40.9 ug/l , sample collected May 23, 2022 08:10, sampling point MRT000	TTHM 2950 EPA method 524.2	Not recorded
Collected May 16, 2022 08:37 Sampling point TF102 Treatment Plant T102 Sample type Routine Lab sample CN-220516-004 Laboratory MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 16, 2022 08:37, sampling point TF102	Cyanide 1024 EPA method QC10204001X	Jan 1, 2020 – Dec 31, 2022
Collected May 16, 2022 08:10 Sampling point TF103 Sample type Routine Lab sample CN-220516-003 Laboratory MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 16, 2022 08:10, sampling point TF103	Cyanide 1024 EPA method QC10204001X	Jan 1, 2020 – Dec 31, 2022
Collected Mar 1, 2022 08:55 Sampling point TF103 Sample type Routine Lab sample NA-220301-019 Laboratory MSDH Lab
94.6 mg/l , sample collected Mar 1, 2022 08:55, sampling point TF103	Sodium 1052 EPA method 200.7	Not recorded
Collected Mar 1, 2022 09:20 Sampling point TF102 Treatment Plant T102 Sample type Routine Lab sample NA-220301-018 Laboratory MSDH Lab
87.5 mg/l , sample collected Mar 1, 2022 09:20, sampling point TF102	Sodium 1052 EPA method 200.7	Not recorded
Collected Mar 1, 2022 08:50 Sampling point TF103 Sample type Routine Lab sample NI-220301-019 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 1, 2022 08:50, sampling point TF103	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 1, 2022 08:50, sampling point TF103	Nitrate 1040 EPA method QC10107041C	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 1, 2022 08:50, sampling point TF103	Nitrite 1041 EPA method QC10107041C	Jan 1, 2022 – Dec 31, 2022
Collected Mar 1, 2022 09:15 Sampling point TF102 Treatment Plant T102 Sample type Routine Lab sample NI-220301-018 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 1, 2022 09:15, sampling point TF102	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 1, 2022 09:15, sampling point TF102	Nitrate 1040 EPA method QC10107041C	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 1, 2022 09:15, sampling point TF102	Nitrite 1041 EPA method QC10107041C	Jan 1, 2022 – Dec 31, 2022
Collected Sep 20, 2021 07:15 Sampling point MRT000 Max. Res. Time Sample type Routine Lab sample HA-210921-015 Laboratory MSDH Lab
17.6 ug/l , sample collected Sep 20, 2021 07:15, sampling point MRT000	Total Haloacetic Acids (Haa5) 2456 EPA method 552.2	Jan 1, 2021 – Dec 31, 2021

Collected
Jun 28, 2022 07:48

Sampling point
TF102 Treatment Plant T102

Sample type
Routine

Lab sample
VO-220629-006

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2017 – Dec 31, 2022
- 1,2,4-Trichlorobenzene 2378 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Cis-1,2-Dichloroethylene 2380 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Xylenes, Total 2955 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Dichloromethane 2964 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- O-Dichlorobenzene 2968 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- P-Dichlorobenzene 2969 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Vinyl Chloride 2976 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1-Dichloroethylene 2977 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Trans-1,2-Dichloroethylene 2979 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,2-Dichloroethane 2980 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1,1-Trichloroethane 2981 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Carbon Tetrachloride 2982 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,2-Dichloropropane 2983 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Trichloroethylene 2984 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1,2-Trichloroethane 2985 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Tetrachloroethylene 2987 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Chlorobenzene 2989 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Benzene 2990 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Toluene 2991 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Ethylbenzene 2992 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Styrene 2996 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
Collected
May 23, 2022 08:15

Sampling point
MRT000 Max. Res. Time

Sample type
Routine

Lab sample
HA-220524-001

Laboratory
MSDH Lab

Monitoring period
Not recorded
- Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
  
  Result
  35.2 ug/l
Collected
May 23, 2022 08:10

Sampling point
MRT000 Max. Res. Time

Sample type
Routine

Lab sample
TH-220524-001

Laboratory
MSDH Lab

Monitoring period
Not recorded
- TTHM 2950 EPA method 524.2
  
  Result
  40.9 ug/l
Collected
May 16, 2022 08:37

Sampling point
TF102 Treatment Plant T102

Sample type
Routine

Lab sample
CN-220516-004

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2020 – Dec 31, 2022
- Cyanide 1024 EPA method QC10204001X
  
  Result
  Not detected below 0.015 mg/l Minimum Reporting Level
Collected
May 16, 2022 08:10

Sampling point
TF103

Sample type
Routine

Lab sample
CN-220516-003

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2020 – Dec 31, 2022
- Cyanide 1024 EPA method QC10204001X
  
  Result
  Not detected below 0.015 mg/l Minimum Reporting Level
Collected
Mar 1, 2022 08:55

Sampling point
TF103

Sample type
Routine

Lab sample
NA-220301-019

Laboratory
MSDH Lab

Monitoring period
Not recorded
- Sodium 1052 EPA method 200.7
  
  Result
  94.6 mg/l
Collected
Mar 1, 2022 09:20

Sampling point
TF102 Treatment Plant T102

Sample type
Routine

Lab sample
NA-220301-018

Laboratory
MSDH Lab

Monitoring period
Not recorded
- Sodium 1052 EPA method 200.7
  
  Result
  87.5 mg/l
Collected
Mar 1, 2022 08:50

Sampling point
TF103

Sample type
Routine

Lab sample
NI-220301-019

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2022 – Dec 31, 2022
- Nitrate-Nitrite 1038 EPA method QC10107041C
  
  Result
  Not detected below 0.1 mg/l Minimum Reporting Level
- Nitrate 1040 EPA method QC10107041C
  
  Result
  Not detected below 0.08 mg/l Minimum Reporting Level
- Nitrite 1041 EPA method QC10107041C
  
  Result
  Not detected below 0.02 mg/l Minimum Reporting Level
Collected
Mar 1, 2022 09:15

Sampling point
TF102 Treatment Plant T102

Sample type
Routine

Lab sample
NI-220301-018

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2022 – Dec 31, 2022
- Nitrate-Nitrite 1038 EPA method QC10107041C
  
  Result
  Not detected below 0.1 mg/l Minimum Reporting Level
- Nitrate 1040 EPA method QC10107041C
  
  Result
  Not detected below 0.08 mg/l Minimum Reporting Level
- Nitrite 1041 EPA method QC10107041C
  
  Result
  Not detected below 0.02 mg/l Minimum Reporting Level
Collected
Sep 20, 2021 07:15

Sampling point
MRT000 Max. Res. Time

Sample type
Routine

Lab sample
HA-210921-015

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2021 – Dec 31, 2021
- Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
  
  Result
  17.6 ug/l

Routine (10).