INDEPENDENT VOC WATER TESTING · MAY 2026

VOC & Trihalomethane Lab Results

Independent lab testing compares untreated and treated drinking-water samples collected at the same location, giving you a clear look at what the lab found before and after treatment.

A clearer look at VOCs

Volatile Organic Compound

/ˈväl-ə-təl ˈôr-ɡa-nik ˈkäm-ˌpau̇nd/ noun

VOCs are a broad group of carbon based chemicals that can be present in water and may transfer into the air when the water is heated or used. They can reach water through fuel, solvents, industrial activity, chemical spills, and some water treatment processes. Many cannot be seen, smelled, or tasted, which is why laboratory testing matters.

Why it matters

Clear water does not always tell the whole story.

VOCs are easy to overlook because they often do not change how water looks. Here are four practical things worth knowing.

You may not know they are there.

Many VOCs dissolve into the water itself. A glass can look and smell completely normal even when testing finds something you would rather know about.

Hot water can move some VOCs into the air.

Because these compounds can transfer from water into the air, exposure is not limited to drinking. Cooking and running a hot shower may matter too.

Both city and well water can be affected.

Some VOCs enter groundwater through fuel or industrial activity. Others, including THMs, can form when chlorine reacts with naturally occurring material during municipal treatment.

Testing gives you an actual answer.

That is why this page includes the complete reports from both samples rather than only a headline. You can see what the laboratory measured in each one.

Names you may see on a VOC report

A Breakdown of Common VOCs

The names can sound intimidating. These quick descriptions make the report easier to understand without turning it into a chemistry lesson.

Chloroform

CHCl₃

A THM that can form when chlorine used for disinfection reacts with organic material in the water.

Disinfection byproduct

Bromodichloromethane

CHBrCl₂

Another member of the THM family and one of the compounds found in the untreated sample on this page.

Detected before treatment

Dibromochloromethane

CHBr₂Cl

A chlorination byproduct included in the laboratory comparison shown on this page.

Detected before treatment

Bromoform

CHBr₃

A brominated THM that may form during disinfection and was also reported in the untreated sample.

Detected before treatment

Vinyl Chloride

C₂H₃Cl

A VOC associated with certain industrial processes, chemical releases, and contaminated groundwater.

Industrial source

Benzene

C₆H₆

A VOC connected to fuel that can reach groundwater through leaks, spills, or industrial activity.

Fuel and groundwater source

Independent lab results

What the Lab Found

The untreated sample reported 60.4 PPB of Total THMs. In the treated sample, Total THMs were reported as Not Detected.

60.4 PPB Untreated water · Total THMs

Not Detected Treated water · Total THMs

All four individual THMs detected in the untreated sample were also reported as Not Detected in the treated sample.

See the complete VOC results View all lab reports

Detailed Lab Results

Review the Tap Score summary analysis, individual THM results, sample information, and complete VOC testing below.

About the reports: Kitting, logistics, and support were provided by SimpleLab, Inc. The results are presented in Tap Score reports, and the drinking-water analysis was performed by Microbac Laboratories.

What Are VOCs and Trihalomethanes?

These names can sound complicated, so here is what they mean in everyday language and why they were included in this water testing.

What are VOCs?

VOCs, or volatile organic compounds, are a broad family of chemicals that can enter water from environmental, household, commercial, and industrial sources. Some VOCs evaporate easily, which means they may move from water into the air when water is heated or used.

What are trihalomethanes?

Trihalomethanes, often shortened to THMs, are a specific group of VOCs that can form as disinfection byproducts. They may develop when chlorine used to disinfect drinking water reacts with naturally occurring organic material. Chlorine plays an important role in controlling microorganisms, but this reaction can create compounds such as chloroform and other THMs.

The simple explanation: VOCs are a large family of chemicals that may be found in water. THMs are one smaller group that can form during chlorine disinfection. Tap Score testing provides a direct before-and-after look at what the laboratory reported in the untreated and treated samples.

Full Tap Score Summary Analysis

The table below reproduces every field shown in the Summary Analysis section of both Tap Score PDF reports.

Report	Sample	Analyte	Unit	Result	Method	Evaluation
MJC5ZT	Bathroom Sink w/out System	Total THMs	PPB	60.4	Calculation	No benchmark available
U6AE3F	Bathroom Sink w/System	Total THMs	PPB	Not Detected	Calculation	No evaluation possible

Detected THM Comparison

These are the four individual compounds detected in the untreated report and their corresponding results in the treated report.

Compound	Untreated result	Untreated evaluation	Treated result	Treated evaluation
Bromodichloromethane	19.6 PPB	> HGL (0)	Not Detected	No evaluation possible
Bromoform	2.21 PPB	> HGL (0)	Not Detected	No evaluation possible
Chloroform	26 PPB	> HGL (0.221)	Not Detected	No evaluation possible
Dibromochloromethane	12.6 PPB	> HGL (0.1)	Not Detected	No evaluation possible

Testing and Sample Information

Testing RequestedVOC Water Test

MatrixDrinking Water

Testing FacilityMicrobac Laboratories

Test MethodEPA 524.2

Untreated Sample · MJC5ZT

Sample location: Bathroom Sink w/out System
Collection date: May 6, 2026
Received date: May 8, 2026
Reported on: May 14, 2026

Treated Sample · U6AE3F

Sample location: Bathroom Sink w/System
Collection date: May 5, 2026
Received date: May 8, 2026
Reported on: May 14, 2026

Testing notes from Tap Score: The reports state that there were no problems with analytical events unless otherwise noted and that quality-control data was within laboratory-defined or method-specified acceptance limits except where noted.

Complete VOC Test Results

Expand either report below to view every analyte and every field included in the laboratory Test Results tables—not only the detected compounds.

View complete untreated results · Report MJC5ZT · 59 analytes

Analyte	Unit	Result	MDL	RL	Method	Evaluation
1,1,1,2 Tetrachloroethane	PPB	Not detected	0.5	2	EPA 524.2	No evaluation possible
1,1,1 Trichloroethane	PPB	Not detected	0.5	2	EPA 524.2	No evaluation possible
1,1,2,2 Tetrachloroethane	PPB	Not detected	0.55	2	EPA 524.2	No evaluation possible
1,1,2 Trichloroethane	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
1,1 Dichloroethane	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
1,1 Dichloroethylene	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
1,1 Dichloropropene	PPB	Not detected	0.46	2	EPA 524.2	No evaluation possible
1,2,3 Trichlorobenzene	PPB	Not detected	0.4	2	EPA 524.2	No evaluation possible
1,2,3 Trichloropropane	PPB	Not detected	0.59	2	EPA 524.2	No evaluation possible
1,2,4 Trichlorobenzene	PPB	Not detected	0.54	2	EPA 524.2	No evaluation possible
1,2,4 Trimethylbenzene	PPB	Not detected	0.41	2	EPA 524.2	No evaluation possible
1,2 Dichlorobenzene	PPB	Not detected	0.47	2	EPA 524.2	No evaluation possible
1,2 Dichloroethane	PPB	Not detected	0.68	2	EPA 524.2	No evaluation possible
1,2 Dichloropropane	PPB	Not detected	0.55	2	EPA 524.2	No evaluation possible
1,3,5 Trimethylbenzene	PPB	Not detected	0.42	2	EPA 524.2	No evaluation possible
1,3 Dichlorobenzene	PPB	Not detected	0.46	2	EPA 524.2	No evaluation possible
1,3 Dichloropropane	PPB	Not detected	0.51	2	EPA 524.2	No evaluation possible
1,4 Dichlorobenzene	PPB	Not detected	0.45	2	EPA 524.2	No evaluation possible
2,2 Dichloropropane	PPB	Not detected	0.5	2	EPA 524.2	No evaluation possible
Benzene	PPB	Not detected	0.46	2	EPA 524.2	No evaluation possible
Bromobenzene	PPB	Not detected	0.57	2	EPA 524.2	No evaluation possible
Bromochloromethane	PPB	Not detected	0.61	2	EPA 524.2	No evaluation possible
Bromodichloromethane	PPB	19.6	0.5	2	EPA 524.2	> HGL (0)
Bromoform	PPB	2.21	0.48	2	EPA 524.2	> HGL (0)
Bromomethane	PPB	Not detected	2	2	EPA 524.2	No evaluation possible
Carbon Tetrachloride	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
Chlorobenzene	PPB	Not detected	0.51	2	EPA 524.2	No evaluation possible
Chloroethane	PPB	Not detected	0.6	2	EPA 524.2	No evaluation possible
Chloroform	PPB	26	0.56	2	EPA 524.2	> HGL (0.221)
Chloromethane	PPB	Not detected	0.43	2	EPA 524.2	No evaluation possible
Chlorotoluene 2	PPB	Not detected	0.41	2	EPA 524.2	No evaluation possible
Chlorotoluene 4	PPB	Not detected	0.39	2	EPA 524.2	No evaluation possible
cis 1,2 Dichloroethylene	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
cis 1,3 Dichloropropene	PPB	Not detected	0.48	2	EPA 524.2	No evaluation possible
Dibromochloromethane	PPB	12.6	0.52	2	EPA 524.2	> HGL (0.1)
Dibromochloropropane	PPB	Not detected	0.58	2	EPA 524.2	No evaluation possible
Dibromomethane	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
Dichlorodifluoromethane	PPB	Not detected	0.46	2	EPA 524.2	No evaluation possible
Dichloromethane	PPB	Not detected	0.95	2	EPA 524.2	No evaluation possible
Ethylbenzene	PPB	Not detected	0.44	2	EPA 524.2	No evaluation possible
Ethylene dibromide	PPB	Not detected	0.48	2	EPA 524.2	No evaluation possible
Hexachlorobutadiene	PPB	Not detected	0.44	2	EPA 524.2	No evaluation possible
Isopropylbenzene	PPB	Not detected	0.42	2	EPA 524.2	No evaluation possible
Methyl Tertiary Butyl Ether	PPB	Not detected	1.12	2	EPA 524.2	No evaluation possible
m,p Xylene	PPB	Not detected	1.35	2	EPA 524.2	No evaluation possible
Naphthalene	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
n Butylbenzene	PPB	Not detected	0.47	2	EPA 524.2	No evaluation possible
n Propylbenzene	PPB	Not detected	0.36	2	EPA 524.2	No evaluation possible
o Xylene	PPB	Not detected	1.35	2	EPA 524.2	No evaluation possible
p Isopropyltoluene	PPB	Not detected	0.41	2	EPA 524.2	No evaluation possible
sec Butylbenzene	PPB	Not detected	0.39	2	EPA 524.2	No evaluation possible
Styrene	PPB	Not detected	0.47	2	EPA 524.2	No evaluation possible
tert Butylbenzene	PPB	Not detected	0.35	2	EPA 524.2	No evaluation possible
Tetrachloroethylene	PPB	Not detected	0.47	2	EPA 524.2	No evaluation possible
Toluene	PPB	Not detected	0.51	2	EPA 524.2	No evaluation possible
trans 1,3 Dichloropropene	PPB	Not detected	0.44	2	EPA 524.2	No evaluation possible
Trichloroethylene	PPB	Not detected	0.45	2	EPA 524.2	No evaluation possible
Trichlorofluoromethane	PPB	Not detected	1.2	2	EPA 524.2	No evaluation possible
Vinyl Chloride	PPB	Not detected	0.3	2	EPA 524.2	No evaluation possible

View complete treated results · Report U6AE3F · 59 analytes

Analyte	Unit	Result	MDL	RL	Method	Evaluation
1,1,1,2 Tetrachloroethane	PPB	Not detected	0.5	2	EPA 524.2	No evaluation possible
1,1,1 Trichloroethane	PPB	Not detected	0.5	2	EPA 524.2	No evaluation possible
1,1,2,2 Tetrachloroethane	PPB	Not detected	0.55	2	EPA 524.2	No evaluation possible
1,1,2 Trichloroethane	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
1,1 Dichloroethane	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
1,1 Dichloroethylene	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
1,1 Dichloropropene	PPB	Not detected	0.46	2	EPA 524.2	No evaluation possible
1,2,3 Trichlorobenzene	PPB	Not detected	0.4	2	EPA 524.2	No evaluation possible
1,2,3 Trichloropropane	PPB	Not detected	0.59	2	EPA 524.2	No evaluation possible
1,2,4 Trichlorobenzene	PPB	Not detected	0.54	2	EPA 524.2	No evaluation possible
1,2,4 Trimethylbenzene	PPB	Not detected	0.41	2	EPA 524.2	No evaluation possible
1,2 Dichlorobenzene	PPB	Not detected	0.47	2	EPA 524.2	No evaluation possible
1,2 Dichloroethane	PPB	Not detected	0.68	2	EPA 524.2	No evaluation possible
1,2 Dichloropropane	PPB	Not detected	0.55	2	EPA 524.2	No evaluation possible
1,3,5 Trimethylbenzene	PPB	Not detected	0.42	2	EPA 524.2	No evaluation possible
1,3 Dichlorobenzene	PPB	Not detected	0.46	2	EPA 524.2	No evaluation possible
1,3 Dichloropropane	PPB	Not detected	0.51	2	EPA 524.2	No evaluation possible
1,4 Dichlorobenzene	PPB	Not detected	0.45	2	EPA 524.2	No evaluation possible
2,2 Dichloropropane	PPB	Not detected	0.5	2	EPA 524.2	No evaluation possible
Benzene	PPB	Not detected	0.46	2	EPA 524.2	No evaluation possible
Bromobenzene	PPB	Not detected	0.57	2	EPA 524.2	No evaluation possible
Bromochloromethane	PPB	Not detected	0.61	2	EPA 524.2	No evaluation possible
Bromodichloromethane	PPB	Not detected	0.5	2	EPA 524.2	No evaluation possible
Bromoform	PPB	Not detected	0.48	2	EPA 524.2	No evaluation possible
Bromomethane	PPB	Not detected	2	2	EPA 524.2	No evaluation possible
Carbon Tetrachloride	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
Chlorobenzene	PPB	Not detected	0.51	2	EPA 524.2	No evaluation possible
Chloroethane	PPB	Not detected	0.6	2	EPA 524.2	No evaluation possible
Chloroform	PPB	Not detected	0.56	2	EPA 524.2	No evaluation possible
Chloromethane	PPB	Not detected	0.43	2	EPA 524.2	No evaluation possible
Chlorotoluene 2	PPB	Not detected	0.41	2	EPA 524.2	No evaluation possible
Chlorotoluene 4	PPB	Not detected	0.39	2	EPA 524.2	No evaluation possible
cis 1,2 Dichloroethylene	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
cis 1,3 Dichloropropene	PPB	Not detected	0.48	2	EPA 524.2	No evaluation possible
Dibromochloromethane	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
Dibromochloropropane	PPB	Not detected	0.58	2	EPA 524.2	No evaluation possible
Dibromomethane	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
Dichlorodifluoromethane	PPB	Not detected	0.46	2	EPA 524.2	No evaluation possible
Dichloromethane	PPB	Not detected	0.95	2	EPA 524.2	No evaluation possible
Ethylbenzene	PPB	Not detected	0.44	2	EPA 524.2	No evaluation possible
Ethylene dibromide	PPB	Not detected	0.48	2	EPA 524.2	No evaluation possible
Hexachlorobutadiene	PPB	Not detected	0.44	2	EPA 524.2	No evaluation possible
Isopropylbenzene	PPB	Not detected	0.42	2	EPA 524.2	No evaluation possible
Methyl Tertiary Butyl Ether	PPB	Not detected	1.12	2	EPA 524.2	No evaluation possible
m,p Xylene	PPB	Not detected	1.35	2	EPA 524.2	No evaluation possible
Naphthalene	PPB	Not detected	0.52	2	EPA 524.2	No evaluation possible
n Butylbenzene	PPB	Not detected	0.47	2	EPA 524.2	No evaluation possible
n Propylbenzene	PPB	Not detected	0.36	2	EPA 524.2	No evaluation possible
o Xylene	PPB	Not detected	1.35	2	EPA 524.2	No evaluation possible
p Isopropyltoluene	PPB	Not detected	0.41	2	EPA 524.2	No evaluation possible
sec Butylbenzene	PPB	Not detected	0.39	2	EPA 524.2	No evaluation possible
Styrene	PPB	Not detected	0.47	2	EPA 524.2	No evaluation possible
tert Butylbenzene	PPB	Not detected	0.35	2	EPA 524.2	No evaluation possible
Tetrachloroethylene	PPB	Not detected	0.47	2	EPA 524.2	No evaluation possible
Toluene	PPB	Not detected	0.51	2	EPA 524.2	No evaluation possible
trans 1,3 Dichloropropene	PPB	Not detected	0.44	2	EPA 524.2	No evaluation possible
Trichloroethylene	PPB	Not detected	0.45	2	EPA 524.2	No evaluation possible
Trichlorofluoromethane	PPB	Not detected	1.2	2	EPA 524.2	No evaluation possible
Vinyl Chloride	PPB	Not detected	0.3	2	EPA 524.2	No evaluation possible

Tap Score report terms: HGL refers to the Health Guidance Level used by Tap Score for health-protective evaluation. MDL is the Method Detection Limit. RL is the Method Reporting Limit.

Testing scope: Results shown are taken from Tap Score reports MJC5ZT and U6AE3F and apply to the specific samples and testing conditions documented in those reports. The treated report identifies the sample as “Bathroom Sink w/System” and does not name a specific Sentry product model.

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