VOCs & pesticides
Atrazine in U.S. tap water
91 public water systems across 18 U.S. states report Atrazine in their annual Consumer Confidence Report. 2 sit at or above the federal limit.
What it is
A widely used agricultural herbicide that reaches water through runoff.
Why it's regulated
Long-term exposure above the federal limit can affect the cardiovascular and reproductive systems.
At or above the federal limit (2)
| Water system | Measured | vs. limit |
|---|---|---|
| Wichita Falls, TX 2024 annual report | 0–0.1 mg/L | 33.3× the limit |
| Frisco, TX 2024 annual report | 3 ug/L | 1.0× the limit |
Within the federal limit (88)
| Water system | Measured |
|---|---|
| Pearland, TX 2024 annual report | 0–2.3 ug/L |
| Topeka, KS 2024 annual report | 0.14–1.8 ug/L |
| Mendota, City of — Mendota, Ca, CA 2023 annual report | 0.5–1 ug/L |
| Columbus, OH 2025 annual report | 0–0.84 ug/L |
| Grand Prairie, TX 2024 annual report | 0.6 ug/L |
| St Louis, MO 2024 annual report | 0.57 ug/L |
| Broken Arrow, OK 2024 annual report | 0.217–0.511 ug/L |
| Tulsa, OK 2024 annual report | 0.511 ug/L |
| Cedar Rapids, IA 2024 annual report | 0–0.5 ug/L |
| City of Robins, IA 2024 annual report | 0–0.5 ug/L |
| Glenbrook Cove Subdivision of Marion, IA 2024 annual report | 0–0.5 ug/L |
| Poweshiek Water Association, IA 2024 annual report | 0–0.5 ug/L |
| Round Rock, TX 2024 annual report | 0.5 ug/L |
| Evansville, IN 2024 annual report | 0.4 ug/L |
| Omaha, NE 2024 annual report | 0.326 ug/L |
| Sugar Land, TX 2024 annual report | 0.31 ug/L |
| Fishers, IN 2024 annual report | 0.29 ug/L |
| Indianapolis, IN 2024 annual report | 0.29 ug/L |
| Morgan County, IN 2024 annual report | 0.29 ug/L |
| Westfield, IN 2024 annual report | 0.29 ug/L |
| Kansas City, MO 2024 annual report | 0.267 ug/L |
| Lees Summit, MO 2025 annual report | 0.267 ug/L |
| Indianapolis, IN 2023 annual report | 0.23 ug/L |
| Indianapolis, IN 2023 annual report | 0.23 ug/L |
| Morgan County, IN 2023 annual report | 0.23 ug/L |
| Westfield, IN 2023 annual report | 0.23 ug/L |
| Lewisville, TX 2024 annual report | 0.2 ug/L |
| Mckinney, TX 2024 annual report | 0.2 ug/L |
| Plano, TX 2024 annual report | 0.1–0.2 ug/L |
| Richardson, TX 2024 annual report | 0.1–0.2 ug/L |
| New Orleans, LA 2024 annual report | 0.11 ug/L |
| Tucson, AZ 2024 annual report | 0.11 ug/L |
| Garland, TX 2024 annual report | 0.1 ug/L |
| Houston, TX 2023 annual report | 0.1 ug/L |
| Mesquite, TX 2024 annual report | 0.1–0.1 ug/L |
| Dallas, TX 2024 annual report | 0.08 ug/L |
| Montecito Water Dist — Santa Barbara, Ca, CA 2023 annual report | 0.056 ug/L |
| Shreveport, LA 2024 annual report | 0.035 ug/L |
| Colorado Springs, CO 2024 annual report | 0.031 ug/L |
| Charleston, SC 2024 annual report | 24 ng/L |
| North Charleston, SC 2024 annual report | 24 ng/L |
| Brown Deer, WI 2023 annual report | 0.02 ug/L |
| Butler, WI 2023 annual report | 0.02 ug/L |
| Franklin, WI 2023 annual report | 0.02 ug/L |
| Greendale, WI 2023 annual report | 0.02 ug/L |
| Greenfield, WI 2023 annual report | 0.02 ug/L |
| Hales Corners, WI 2023 annual report | 0.02 ug/L |
| Menomonee Falls, WI 2023 annual report | 0.02 ug/L |
| Mequon, WI 2023 annual report | 0.02 ug/L |
| Milwaukee, WI 2023 annual report | 0.02 ug/L |
Showing 50 of 88. The full list is in the JSON API.
Frequently asked
+What is Atrazine?
A widely used agricultural herbicide that reaches water through runoff. Long-term exposure above the federal limit can affect the cardiovascular and reproductive systems.
+What is the federal limit for Atrazine in drinking water?
The federal NL for Atrazine is 700 ng/L. The EPA enforces this against the regulated reporting statistic (typically a running annual average or 90th percentile), not a single-sample spike.
+How many U.S. water systems have Atrazine over the federal limit?
2 of the 91 public water systems on The Water Map report Atrazine at or above its federal limit, spanning 18 U.S. states. The full list is on this page.
+How can I check if Atrazine is in my city's tap water?
Search your city on The Water Map (https://www.thewatermap.com/) or browse the list on this page. Every U.S. public water utility is required to publish an annual Consumer Confidence Report that lists every contaminant it measured, including Atrazine.