The Power of Information

National Drinking Water Database


Heatherloch Mud - Houston, TX


Serves 6,129 people - Test data available: 2004-2007

This drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group (EWG) by the Texas Commission on Environmental Quality . It is part of EWG's national database that includes 47,667 drinking water utilities and 20 million test results. Water utilities nationwide detected more than 300 pollutants between 2004 and 2009. More than half of these chemicals are unregulated, legal in any amount. Despite this widespread contamination, the federal government invests few resources to protecting rivers, reservoirs, and groundwater from pollution in the first place. The information below summarizes test results for this utility and lists potential health concerns.

 
This Drinking Water System
National Average
Exceed Health GuidelinesTests showing chemicals at concentrations above health guidelines established by federal and state health agencies. These guidelines are typically set at a levels that pose no significant health risk.
5 chemicals
4
Health Standard ExceedencesChemicals detected at concentrations above the legal limit, the Maximum Contaminant Level (MCLs) established by the U.S. EPA. Most MCLs are based on annual averages, so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.
0 chemicals
0.5
Pollutants FoundThe total number of contaminants detected since 2004, according to data provided by the state water agency.
17 chemicals
8
Tests ConductedThe total number of number of water quality tests conducted by water utilities and recorded in data provided by the state water agency.
476 tests
420

Contaminants Exceeding Health Guidelines

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
DibromochloromethaneDibromochloromethane is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.1.06 ppb
1.4 ppb
Yes
0.4 ppb
No
80 ppb
BromoformBromoform is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.51 ppb
1.05 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
80 ppb
BenzeneBenzene is a petroleum chemical that contaminates drinking water due to emissions from petroleum and chemical industries, leaching landfills and gas storage tanks.2.05 ppb
3.25 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
5 ppb
1,2-Dichloropropane1,2-Dichloropropane is used as a solvent and intermediate in the production of dry cleaning agent perchloroethylene; it is released as a pollutant from chemical factories, landfills, and from agricultural soil due to former use as a fumigant.0.25 ppb
0.45 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
5 ppb
BromodichloromethaneBromodichloromethane is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.13 ppb
0.5 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
80 ppb
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Other Detected Contaminants

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Total trihalomethanes (TTHMs)Total trihalomethanes constitute the sum of four disinfection byproducts: chloroform, bromodichloromethane, dibromochloromethane, and bromoform.1.91 ppb
2.3 ppb
No
9.8 ppb
No
80 ppb
m- & p- XyleneXylene is a petroleum-derived solvent used in the printing, rubber, and leather industries, and as a cleaning agent, a thinner for paint, and an ingredient in paints and varnishes.2.88 ppb
5.5 ppb
No
10000 ppb
No
10000 ppb
EthylbenzeneEthylbenzene is a pollutant from petroleum refineries and industrial chemical factories; it is also used to make plastics, and may be present as an impurity in some insecticides.0.63 ppb
1.1 ppb
No
300 ppb
No
700 ppb
NitrateNitrate enters drinking water sources from fertilizer runoff, leaching septic tanks, and erosion of natural deposits; it is also emitted by chemical, petrochemical and metal-finishing industries.<0.01 ppm
0.01 ppm
No
10 ppm
No
10 ppm
TolueneToluene is a pollutant from petroleum refineries and a chemical used in plastics manufacturing as well as the pharmaceutical, paint and furniture industries.2.73 ppb
6.5 ppb
No
150 ppb
No
1000 ppb
ChloroformChloroform is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.21 ppb
0.85 ppb
No
5.7 ppb
No
80 ppb
o-Xyleneo-Xylene is a petroleum-derived solvent used in the printing, rubber, and leather industries; it is also used as a cleaning agent, a thinner for paint, and an ingredient in paints and varnishes.0.15 ppb
0.45 ppb
No
10000 ppb
No
10000 ppb
PentanePentane is a short, volatile hydrocarbon; it is a component of some fuels, specialty solvent, and a blowing agent used in production of polystyrene foam.26 ppb
52 ppb
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
ButaneButane is a component of natural gas as well as aerosols and lighter fuel, and is used as an extraction agent in the food processing industry.53 ppb
53 ppb
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
ManganeseManganese is a naturally occurring element released from mineral deposits as well as industrial use.13.8 ppb
13.8 ppb
No
50 ppb
No
50 ppb
CopperCopper is a naturally occuring metal and drinking water contaminant that enters tap water by corrosion of household plumbing systems and erosion of natural deposits.2.3 ppb
2.3 ppb
No
300 ppb
No
1000 ppb
Barium (total)Barium is a mineral that enters drinking water through drilling and mining waste runoff, discharges from chemical industries and erosion of natural deposits.250 ppb
250 ppb
No
700 ppb
No
2000 ppb
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Contaminants Not Detected - 89 chemicals

1,1,1,2-Tetrachloroethane, 1,1,1-Trichloroethane, 1,1,2,2-Tetrachloroethane, 1,1,2-Trichloroethane, 1,1-Dichloroethane, 1,1-Dichloroethylene, 1,1-Dichloropropene, 1,2 Dibromo-3-chloropropane (DBCP), 1,2,3-Trichlorobenzene, 1,2,3-Trichloropropane, 1,2,4-Trichlorobenzene, 1,2,4-Trimethylbenzene, 1,2-Dichloroethane, 1,3,5-Trimethylbenzene, 1,3-Dichloropropane, 2,2-Dichloropropane, 2-Hexanone, Acetone, Acrylonitrile, Aluminum, Aniline, Antimony (total), Arsenic (total), Beryllium (total), Bromobenzene, Bromochloroacetic acid, Bromochloromethane, Bromomethane, Butyl Acetate, Cadmium (total), Carbon tetrachloride, Chloroethane, Chloromethane, Chromium (total), cis-1,2-Dichloroethylene, cis-1,3-Dichloropropene, Cyanogen Chloride, Dalapon, Dibromoacetic acid, Dibromomethane, Dichloroacetic acid, Dichloroacetonitrile, Dichlorodifluoromethane, Dichloromethane (methylene chloride), Ethyl Methacrylate, Ethylene dibromide (EDB), Hexachlorobutadiene, Iodomethane, Isopropylbenzene, Lead (total), m-Dichlorobenzene, m-Xylene, Mercury (total inorganic), Methyl ethyl ketone, Methyl isobutyl ketone, Methyl methacrylate, Monobromoacetic acid, Monochloroacetic acid, Monochlorobenzene (Chlorobenzene), Mtbe, n-Butylbenzene, n-Propylbenzene, Naphthalene, Nitrite, o-Chlorotoluene, o-Dichlorobenzene, p-Chlorotoluene, p-Dichlorobenzene, p-Isopropyltoluene, p-Xylene, Phenols, sec-Butylbenzene, Selenium (total), Silver (total), Styrene, tert-Butylbenzene, Tetrachloroethylene, Tetrahydrofuran, Thallium (total), Total haloacetic acids (HAAs), trans-1,2-Dichloroethylene, trans-1,3-Dichloropropene, Trichloroacetic acid, Trichloroethylene, Trichlorofluoromethane, Vinyl 2-chloroethyl Ether, Vinyl acetate, Vinyl chloride, Xylenes (total)

Pollution Summary

17Total Contaminants Detected (2004 - 2007)

Barium (total), Copper, Manganese, Nitrate, Butane, Pentane, Chloroform, Bromoform, Bromodichloromethane, Dibromochloromethane, Total trihalomethanes (TTHMs), 1,2-Dichloropropane, Benzene, Toluene, Ethylbenzene, o-Xylene, m- & p- Xylene

3Agricultural Pollutants
(pesticides, fertilizer, factory farms)

Nitrate, 1,2-Dichloropropane, Ethylbenzene

6Sprawl and Urban Pollutants
(road runoff, lawn pesticides, human waste)

Copper, Nitrate, Butane, Benzene, o-Xylene, m- & p- Xylene

11Industrial Pollutants

Barium (total), Manganese, Nitrate, Butane, Pentane, 1,2-Dichloropropane, Benzene, Toluene, Ethylbenzene, o-Xylene, m- & p- Xylene

5Water Treatment and Distribution Byproducts
(pipes and fixtures, treatment chemicals and byproducts)

Chloroform, Bromoform, Bromodichloromethane, Dibromochloromethane, Total trihalomethanes (TTHMs)

4Naturally Occurring
(naturally present but increased for lands denuded by sprawl, agriculture, or industrial development)

Barium (total), Copper, Manganese, Nitrate

2Unregulated Contaminants
EPA has not established a maximum legal limit in tapwater for these contaminants

Butane, Pentane

EPA Violation Summary

No violations were reported for this system since 2004.

Information on violations is drawn directly from EPA's national violations database in the Agency's Safe Drinking Water Information System. Analyses by others have raised questions about the quality of the information in EPA's database. For the purposes of this investigation, EWG is not showing below or including in our analyses, those violations for individual water suppliers that occurred on days for which the total number of violations assigned by EPA to that water supplier was greater than 20. This criteria was based on common characteristics of incorrect violations data as identified by water utilities, from a review of EPA's violations data by several hundred utilities prior to the release of EWG's investigation.