The Power of Information

National Drinking Water Database


National Drinking Water Database - Chemical Contaminants

2,4,5-TP (Silvex)


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

2,4,5-TP (Silvex) is an herbicide banned in 1985; it was formerly used in homes and on recreation areas, industrial sites, lumber yards, vacant lots, lawns and turf, and crops including rice. [read more]

 
Detected
Found above
health guidelines
Found above
legal limit
States
10
1
-
Water utilities
20
1
-
People Served
3,218,735
50
-

Health Concerns for 2,4,5-TP (Silvex):


2,4,5-TP (Silvex) Exposure by State

Water utilities in 10 states have reported detecting 2,4,5-TP (Silvex) in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with 2,4,5-TP (Silvex) contaminationWater suppliers reporting 2,4,5-TP (Silvex) above health-based limits
SystemsPopulationSystemsPopulation
Florida82,629,910150
Indiana1250,00000
Delaware1201,00000
Connecticut339,89700
Virginia137,00000
Maryland232,19400
Wisconsin114,00000
South Dakota113,70300
New York180000
North Carolina123100
Total203,218,735150

The Most Polluted Communities

20 water utilities reported detecting 2,4,5-TP (Silvex) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average 2,4,5-TP (Silvex) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Glen St. Mary Water System
Glen St. Mary, FL
501 of 102.8 ppb
(0 to 28 ppb)
2Yankton
Yankton, SD
13,7031 of 21.05 ppb
(0 to 2.1 ppb)
3City of Manassas
Manassas, VA
37,0001 of 20.7 ppb
(0 to 1.4 ppb)
4Florida City
Florida City, FL
9,4451 of 30.33 ppb
(0 to 1 ppb)
5CTWC - Naugatuck Reg-Collinsville Sys
Naugatuck, CT
6,3241 of 50.09 ppb
(0 to 0.44 ppb)
6Paradise Point S/D
Gastonia, NC
2311 of 70.08 ppb
(0 to 0.56 ppb)
7Whitewater Waterworks
Whitewater, WI
14,0001 of 10.05 ppb
(0.05 ppb)
8Town of Federalsburg
Federalsburg, MD
2,4501 of 10.03 ppb
(0.03 ppb)
9Putnam Water Pollution Control Authority
Putnam, CT
7,3001 of 110.02 ppb
(0 to 0.22 ppb)
10New London Dept. of Public Utilities
New London, CT
26,2731 of 60.02 ppb
(0 to 0.12 ppb)

Health Based Limits for 2,4,5-TP (Silvex)

StandardDescriptionLevel
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.10 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.25 ppb
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.50 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.50 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.50 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.200 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.200 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.300 ppb

Testing Summary for 2,4,5-TP (Silvex)

Are tests routinely required for 2,4,5-TP (Silvex) by federal law?Yes
Water suppliers reporting tests for 2,4,5-TP (Silvex) (2004-2009):19,454 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.4 per year

Violation Summary for 2,4,5-TP (Silvex)

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards for 2,4,5-TP (Silvex) since 2004

Maximum Contaminant Level Exceedance Violations0
Monitoring Violations1,676
Reporting Violations0

Occupational hazards

Type of concern: Reference:
Allowed workplace exposures restricted to low doses European Union - Classification & Labelling

Irritation (skin, eyes, or lungs)

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

Organ system toxicity (non-reproductive)

Type of concern: Reference:
Classified as toxic or harmful European Union - Classification & Labelling

Cancer

Type of concern: Reference:
Cancer - not classifiable/not likely to be human carcinogen EPA Integrated Risk Information System (IRIS)

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 & LabellingFENOPROP•Harmful
•Harmful if swallowed
•Irritant (eyes, skin, or lungs)
•Irritating to skin
•Dangerous for the environment
•Very toxic to aquatic organisms
EPA Integrated Risk Information System (IRIS)2(2,4,5-TRICHLOROPHENOXY) PROPIONIC ACID (2,4,5-TP)•Group D: Not classifiable as to human carcinogenicity (EPA classification)



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 Integrated Risk Information System (IRIS)EPA (U.S. Environmental Protection Agency). 2008. Integrated Risk Information System (IRIS). Evidence for human carcinogenicity based on 1986-2005 guidelines.

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