The Power of Information

National Drinking Water Database


National Drinking Water Database - Chemical Contaminants

Dalapon


Status: Regulated - EPA has established a maximum legal limit in tapwater for this contaminant.

Dalapon is an herbicide used on roads, railway tracks and other rights of way. [read more]

 
Detected
Found above
health guidelines
Found above
legal limit
States
24
-
-
Water utilities
756
-
-
People Served
19,116,278
-
-

Health Concerns for Dalapon:


Dalapon Exposure by State

Water utilities in 24 states have reported detecting Dalapon in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with Dalapon contamination
SystemsPopulation
Texas5296,379,686
Maryland343,682,696
Florida503,119,453
North Carolina692,261,385
Indiana3964,940
Virginia2759,117
Arizona4446,068
Kentucky7339,265
New York6260,765
Pennsylvania1250,000
Delaware1201,000
California2175,600
Connecticut1468,137
Alabama463,603
Massachusetts261,000
Minnesota1247,224
Michigan412,731
Iowa410,873
Illinois23,625
Maine12,840
Wisconsin12,160
Washington11,995
Oregon11,800
Montana2315
Total75619,116,278

The Most Polluted Communities

756 water utilities reported detecting Dalapon in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Dalapon level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Phenix City Utilities
Phenix City, AL
35,3581 of 218.15 ppb
(0 to 36.3 ppb)
2Millry Water Works
Millry, AL
2,2141 of 17.3 ppb
(7.3 ppb)
3Lakewood Water System
Lufkin, TX
1104 of 46.5 ppb
(4.3 to 9.2 ppb)
4Horseshoe Beach Wtp
Horseshoe Beach, FL
8204 of 65.07 ppb
(0 to 10 ppb)
5Rolling Hills Subdivision
Shelbyville, TX
421 of 14.2 ppb
(4.2 ppb)
6Thunderbird Bay Subdivision
Dallas, TX
80014 of 144.05 ppb
(1.6 to 17.5 ppb)
7Red River Army Depot
Texarkana, TX
2,95010 of 103.99 ppb
(2.6 to 6.3 ppb)
8Everglades City
Everglades City, FL
2,5005 of 83.95 ppb
(0 to 7.7 ppb)
9Walnut Ridge Estates Water System
Zavalla, TX
1951 of 23.9 ppb
(0 to 7.8 ppb)
10Riverside Harbor Ll
Livingston, TX
3787 of 153.81 ppb
(0 to 10.1 ppb)

Health Based Limits for Dalapon

StandardDescriptionLevel
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.200 ppb
Maximum Contaminant Limit Goal (MCLG)A 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.200 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.200 ppb
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.790 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.900 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.3000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.3000 ppb

Testing Summary for Dalapon

Are tests routinely required for Dalapon by federal law?Yes
Water suppliers reporting tests for Dalapon (2004-2009):23,270 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.4 per year

Violation Summary for Dalapon

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards for Dalapon since 2004

Maximum Contaminant Level Exceedance Violations0
Monitoring Violations1,640
Reporting Violations0

Irritation (skin, eyes, or lungs)

Type of concern: Reference:
Classified as irritant European Union - Classification & Labelling

Cancer

Type of concern: Reference:
Cancer - not classifiable/not likely to be human carcinogen EPA Water Disinfection By-Products Carcinogenicity
One or more in vitro tests non-mammalian cells show positive mutation results RTECS®- Indian Journal of Experimental Biology 1973

Occupational hazards

Type of concern: Reference:
Allowed workplace exposures restricted to moderate doses RTECS®- TLV/BEI,2007

Ecotoxicology

Type of concern: Reference:
Wildlife and environmental toxicity European Union - Classification & Labelling



Government, industry, academic studies and classifications

government/industry list/academic study appears on list as classification(s)
European Union - Classification & LabellingDALAPON;;2,2-DICHLOROPROPIONIC ACID; [1];DALAPON-SODIUM;;SODIUM 2,2-DICHLOROPROPIONATE [2]•Irritant (eyes, skin, or lungs)
•Irritating to skin
•Harmful to aquatic organisms
EPA Water Disinfection By-Products Carcinogenicity2,2-DICHLOROPROPANOIC ACID•Marginal concern for potential carcinogenicity
National Library of Medicine HazMap2,2-DICHLOROPROPIONIC ACIDSD: No;
RTECS®- TLV/BEI,20072,2-DICHLOROPROPIONIC ACID• occupationally related - ACGIH TLV (human TWA)
RTECS®- Indian Journal of Experimental Biology 19732,2-DICHLOROPROPIONIC ACID• mutagenic - Positive mutation assay: Mutation in Micro-organism (other micro-organisms )



references

government/industry list/academic study reference
European Union - Classification & LabellingCPS&Q (Consumer Products Safety & Quality) formely known as ECB (European Chemicals Bureau). 2008. Classification and Labelling: Chemicals: Annex VI of Directive 67/548/EEC through the 31st ATP.
EPA Water Disinfection By-Products CarcinogenicityEPA (U.S. Environmental Protection Agency). 2006. EPA Water Disinfection By-Products with Carcinogenicity Estimates. Last updated: 10 April 2006.
National Library of Medicine HazMapNLM (National Library of Medicine). 2006. HazMap — Occupational Exposure to Hazardous Agents.
RTECS®- TLV/BEI,2007RTECS®- TLV/BEI,2007
RTECS®- Indian Journal of Experimental Biology 1973RTECS®- Indian Journal of Experimental Biology. (Publications & Information Directorate, CSIR, Hillside Rd., New Delhi 110 012, India) V.1- 11,114,1973

"RTECS®" is a United States trademark owned and licensed under authority of the U.S. Government, by and through MDL Information Systems, Inc.