Atrazine

City of Chandler

Atrazine is a herbicide commonly detected in drinking water that comes from cornfield and other agricultural runoff. It is a hormone disrupter that harms the male and female reproductive systems of people and wildlife. Read More.

Federal laws allow up to 3 parts per billion of atrazine in treated tap water. Water suppliers average atrazine measurements collected over a year, which means that the reported values underestimate intense spikes of elevated exposures during the periods in late spring and early summer when atrazine is applied in large amounts on farm fields.

Human epidemiological studies suggest that federal standards for atrazine are insufficient to protect public health. In 1999 the California Office of Environmental Health Hazard Assessment set a public health goal of 0.15 parts per billion for atrazine in drinking water, based on a study finding increased rates of breast cancer in rats exposed to the chemical. California’s legal maximum for atrazine in tap water is 1 ppb.

Click here to read more about atrazine.

MORE ABOUT THIS CONTAMINANT

163

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	N/A	0	N/A
2015	ND	67	ND
2016	ND	1	ND
2017	ND	6	ND
2018	ND	87	ND
2019	ND	2	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for atrazine was defined by EWG based on epidemiological studies of human exposure to atrazine in drinking water.. This health guideline protects against harm to the developing fetus, harm to the reproductive system and hormone disruption.

EPA Maximum Contaminant
Level (MCL) 3 ppb

The legal limit for atrazine, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1980s. This limit does not fully protect against harm to the reproductive system, harm to the developing fetus, and hormone disruption.

ppb = parts per billion

All test results

Date	Lab ID	Result
2015-01-13	3170543	ND
2015-01-13	3170544	ND
2015-01-13	3170555	ND
2015-01-15	3171707	ND
2015-01-15	3171865	ND
2015-01-15	3171870	ND
2015-01-15	3179459	ND
2015-01-20	3174455	ND
2015-01-20	3174466	ND
2015-01-20	3174467	ND
2015-01-22	3176109	ND
2015-01-22	3176112	ND
2015-01-22	3176113	ND
2015-01-26	3177397	ND
2015-01-26	3177398	ND
2015-01-26	3177399	ND
2015-01-27	3178169	ND
2015-01-27	3178170	ND
2015-01-27	3178173	ND
2015-01-29	3179457	ND
2015-01-29	3179458	ND
2015-02-02	3180791	ND
2015-02-02	3180794	ND
2015-02-02	3180795	ND
2015-02-03	3181598	ND
2015-02-03	3181606	ND
2015-02-03	3181856	ND
2015-04-13	3224688	ND
2015-04-13	3224691	ND
2015-04-13	3224692	ND
2015-04-13	3224697	ND
2015-04-15	3226469	ND
2015-04-15	3226476	ND
2015-04-22	3229513	ND
2015-07-14	3280717	ND
2015-07-14	3280720S	ND
2015-07-14	3280721	ND
2015-07-14	3280722	ND
2015-07-15	3281834	ND
2015-07-15	3281837	ND
2015-07-15	3281838	ND
2015-07-16	3282442	ND
2015-07-16	3282445	ND
2015-07-16	3282447	ND
2015-07-16	3282448	ND
2015-07-16	328446	ND
2015-07-22	3286721	ND
2015-07-22	3286724	ND
2015-07-22	3286725	ND
2015-07-22	3286726	ND
2015-07-23	3288148	ND
2015-07-23	3288149	ND
2015-07-27	3288953	ND
2015-07-27	3288956	ND
2015-07-27	3288957	ND
2015-07-27	3288958	ND
2015-07-29	3289669	ND
2015-07-29	3289672	ND
2015-07-30	3290293	ND
2015-07-30	3290296	ND
2015-11-03	3353128	ND
2015-11-03	3353129	ND
2015-11-03	3353130	ND
2015-11-05	3354821	ND
2015-11-05	3354824	ND
2015-11-05	3354825	ND
2015-11-18	3361735	ND
2016-12-29	3613602	ND
2017-06-12	550-84299-1 SOC	ND
2017-06-19	550-84660-1	ND
2017-06-28	550-85097-1 SOC	ND
2017-08-30	550-88911-1SOC	ND
2017-08-31	550-89003-1SOC	ND
2017-10-12	550-91428-5 SOC	ND
2018-01-23	550-96737-1 SOC	ND
2018-01-23	550-96737-2 SOC	ND
2018-01-23	550-96737-3 SOC	ND
2018-01-23	550-96737-4 SOC	ND
2018-01-24	550-96821-1 SOC	ND
2018-01-24	550-96821-2 SOC	ND
2018-01-24	550-96821-3 SOC	ND
2018-01-24	550-96821-4 SOC	ND
2018-01-24	550-96821-5 SOC	ND
2018-01-25	550-96914-1 SOC	ND
2018-01-25	550-96914-2 SOC	ND
2018-01-25	550-96914-4 SOC	ND
2018-01-25	550-96914-5 SOC	ND
2018-01-29	550-97023-1 SOC	ND
2018-01-30	550-97100-2	ND
2018-01-30	550-97100-3 SOC	ND
2018-01-31	550-97179-1 SOC	ND
2018-02-01	550-97256-1 SOC	ND
2018-02-01	550-97256-3 SOC	ND
2018-02-01	550-97256-4 SOC	ND
2018-03-05	550-98895-1 SOC	ND
2018-03-05	550-98895-2 SOC	ND
2018-03-05	550-98895-4 SOC	ND
2018-03-05	550-98895-5 SOC	ND
2018-03-06	550-98981-2 SOC	ND
2018-03-20	550-99786-1	ND
2018-03-20	550-99786-3	ND
2018-04-17	550-101375-2 SOC	ND
2018-04-17	550-101375-3	ND
2018-04-18	550-101450-2 SOC	ND
2018-04-18	550-101450-4 SOC	ND
2018-04-19	550-101546-2	ND
2018-04-19	550-101546-4 SOC	ND
2018-04-20	550-101629-1 SOC	ND
2018-06-12	3691645	ND
2018-06-12	3961646	ND
2018-06-12	3961647	ND
2018-06-12	3961648	ND
2018-06-12	3961649	ND
2018-06-12	3961650	ND
2018-06-12	3961651	ND
2018-06-26	3974609	ND
2018-06-28	550-105094-2 SOC	ND
2018-06-28	550-105094-3 SOC	ND
2018-07-23	3999963	ND
2018-07-23	3999966	ND
2018-07-23	3999967	ND
2018-07-23	3999968	ND
2018-07-23	3999969	ND
2018-07-23	3999983	ND
2018-07-24	4001821	ND
2018-07-24	4001824	ND
2018-07-24	4001825	ND
2018-07-24	4001826	ND
2018-07-24	4001827	ND
2018-07-25	4004396	ND
2018-07-25	4004399	ND
2018-07-25	4004400	ND
2018-07-25	4004401	ND
2018-07-25	4004402	ND
2018-07-25	4004403	ND
2018-07-26	4004345	ND
2018-07-26	4004348	ND
2018-07-26	4004349	ND
2018-07-26	4004350	ND
2018-07-26	4004351	ND
2018-07-26	4004352	ND
2018-07-30	4008766	ND
2018-07-30	4008769	ND
2018-07-30	4008770	ND
2018-07-30	4008771	ND
2018-07-30	4008772	ND
2018-08-21	4031673	ND
2018-10-17	550-111920-1	ND
2018-10-18	4100496	ND
2018-10-18	4100497	ND
2018-10-18	4100498	ND
2018-10-22	4101183	ND
2018-10-22	4101184	ND
2018-10-22	4101187	ND
2018-10-23	4101653	ND
2018-10-24	4102278	ND
2018-10-24	4102281	ND
2018-10-25	4104531	ND
2018-10-25	4104537	ND
2018-10-31	4107548	ND
2018-10-31	4107551	ND
2019-01-28	201901280135S	ND
2019-07-22	201907220239S	ND