Dalapon in drinking water
1,111 active public water systems in 34 states had a Dalapon violation in the past three years, and 53 have one that is still unresolved.
You are on Tapcensus, an independent guide to the EPA compliance records of every public water system in the United States. This page explains Dalapon and lists the water systems whose records include a related violation. It does not show measured levels.
Is Dalapon in the records for your water system?
Enter a ZIP code, town, or street address to see the water systems that serve your area, their status, and which rules and contaminants appear in their violations.
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What it is and where it comes from
Dalapon is an organochlorine herbicide used to control grassy weeds in sugarcane, corn, and other crops, as well as along roadsides and waterways. It remains in agricultural use in the United States. It reaches water primarily through agricultural runoff and leaching.
Health effects
Long-term exposure to dalapon is associated with liver and kidney effects in animal studies. EPA has not classified it as a human carcinogen based on available data. The general population is the primary concern for chronic low-level exposure through drinking water.
The standard and what a violation means
EPA limit: 0.2 mg/L (200 ppb).
Water systems with a Dalapon violation, by state
Active public water systems that reported at least one related violation to EPA in the past three years. Each state links to the list of its affected systems.
| State | Systems with violations, 3 yr | Share of active systems | Unresolved |
|---|---|---|---|
| Pennsylvania | 203 | 3% | 7 |
| New York | 119 | 1% | 1 |
| Oklahoma | 99 | 8% | 0 |
| Texas | 84 | 1% | 0 |
| Oregon | 72 | 3% | 3 |
| Illinois | 51 | 1% | 11 |
| Washington | 44 | 1% | 9 |
| Colorado | 42 | 2% | 4 |
| Idaho | 37 | 2% | 3 |
| Montana | 37 | 2% | 1 |
| Connecticut | 30 | 1% | 1 |
| Utah | 29 | 3% | 1 |
| California | 28 | 0% | 1 |
| Indiana | 27 | 1% | 2 |
| Alaska | 25 | 2% | 0 |
| Alabama | 25 | 4% | 0 |
| Wyoming | 24 | 3% | 1 |
| Missouri | 19 | 1% | 1 |
| Wisconsin | 18 | 0% | 0 |
| Nevada | 17 | 3% | 0 |
| Arizona | 14 | 1% | 1 |
| North Carolina | 14 | 0% | 1 |
| Massachusetts | 12 | 1% | 1 |
| Maine | 8 | 0% | 0 |
| Rhode Island | 8 | 2% | 0 |
| Minnesota | 6 | 0% | 2 |
| New Jersey | 6 | 0% | 2 |
| South Dakota | 3 | 0% | 0 |
| Virginia | 3 | 0% | 0 |
| North Dakota | 2 | 1% | 0 |
| New Mexico | 2 | 0% | 0 |
| Florida | 1 | 0% | 0 |
| Kentucky | 1 | 0% | 0 |
| Tennessee | 1 | 0% | 0 |
Largest water systems with a Dalapon violation
The ten biggest systems, by people served, whose records include a related violation in the past three years.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Denver Water Board Denver County |
1,287,000 | 3 | 0 | |
|
Gilbert, Town of Gilbert · Maricopa County |
247,600 | 9 | 1 | |
|
Corona, City of Corona · Riverside County |
169,380 | 6 | 0 | |
|
City of Sunnyvale Sunnyvale · Santa Clara County |
157,566 | 5 | 0 | |
|
Rockford Rockford · Winnebago County |
147,051 | 3 | 0 | |
|
Epcor Agua Fria Surprise · Maricopa County |
128,040 | 5 | 0 | |
|
Pasco Water Department Franklin County |
115,102 | 2 | 0 | |
|
Elgin Elgin · Kane County |
114,797 | 3 | 0 | |
|
Inima USA / Aquaria LLC Dighton · Bristol County |
105,643 | 1 | 0 | |
|
Lehi City Utah County |
93,446 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Dalapon, including monitoring and reporting lapses. Rules violated and status in the systems table are for the whole system, not Dalapon alone. Counts cover active systems in all 50 states and the District of Columbia.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.