1,2-Dibromo-3-chloropropane (DBCP)
City Of Modesto - Del Rio
1,2-Dibromo-3-chloropropane is a pesticide fumigant banned in the 1970s after scientists discovered it caused sterility in men who worked with it. The chemical causes cancer in laboratory animals and may cause cancer in people. Read More.
This pesticide breaks down very slowly in the environment. It remains in groundwater and drinking water wells in the agricultural areas where it was sprayed in the past. Men exposed to this pesticide in the fields suffered from infertility and testicular damage, and tended to have fewer male babies.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 0.206 ppb | 3 | 3 | 0.0330 ppb - 0.550 ppb |
| 2019 | 0.0320 ppb | 2 | 2 | 0.0290 ppb - 0.0350 ppb |
| 2020 | 0.246 ppb | 8 | 4 | ND - 0.870 ppb |
| 2021 | 0.248 ppb | 24 | 11 | ND - 0.810 ppb |
| 2022 | 0.140 ppb | 27 | 14 | ND - 0.420 ppb |
| 2023 | 0.0681 ppb | 26 | 4 | ND - 0.750 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.0017 ppb
The EWG Health Guideline of 0.0017 ppb for 1,2-dibromo-3-chloropropane was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
EPA Maximum Contaminant
Level (MCL): 0.2 ppb
The legal limit for 1,2-dibromo-3-chloropropane, established in 1991, was based on analytical detection limits at the time that the standard was set. This limit does not fully protect against the risk of cancer due to 1,2-dibromo-3-chloropropane exposure.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-04-04 | CA5010029_002_002-201804040835 | 0.0330 ppb |
| 2018-05-14 | CA5010029_010_010-201805140830 | 0.550 ppb |
| 2018-11-07 | CA5010029_004_004-201811070845 | 0.0360 ppb |
| 2019-04-03 | CA5010029_002_002-201904030755 | 0.0290 ppb |
| 2019-11-06 | CA5010029_004_004-201911061240 | 0.0350 ppb |
| 2020-04-01 | CA5010029_002_002-202004010925 | 0.0440 ppb |
| 2020-05-13 | CA5010029_010_010-202005131047 | 0.870 ppb |
| 2020-11-04 | CA5010029_011_011-202011040920 | ND |
| 2020-11-04 | CA5010029_010_010-202011040940 | 0.360 ppb |
| 2020-11-04 | CA5010029_004_004-202011041115 | ND |
| 2020-12-02 | CA5010029_011_011-202012021020 | ND |
| 2020-12-02 | CA5010029_001_001-202012021125 | ND |
| 2020-12-02 | CA5010029_010_010-202012020955 | 0.690 ppb |
| 2021-01-06 | CA5010029_010_010-202101060805 | 0.420 ppb |
| 2021-01-06 | CA5010029_011_011-202101060907 | ND |
| 2021-02-03 | CA5010029_010_010-202102030817 | 0.810 ppb |
| 2021-02-03 | CA5010029_011_011-202102030902 | ND |
| 2021-03-03 | CA5010029_010_010-202103030840 | 0.760 ppb |
| 2021-03-03 | CA5010029_011_011-202103030925 | ND |
| 2021-04-07 | CA5010029_010_010-202104070815 | 0.660 ppb |
| 2021-04-07 | CA5010029_002_002-202104070950 | ND |
| 2021-04-07 | CA5010029_011_011-202104070900 | ND |
| 2021-05-04 | CA5010029_010_010-202105040900 | 0.370 ppb |
| 2021-05-04 | CA5010029_011_011-202105040835 | ND |
| 2021-06-01 | CA5010029_010_010-202106010755 | 0.670 ppb |
| 2021-06-01 | CA5010029_011_011-202106010910 | ND |
| 2021-07-06 | CA5010029_011_011-202107061245 | ND |
| 2021-07-06 | CA5010029_010_010-202107061040 | 0.460 ppb |
| 2021-09-01 | CA5010029_011_011-202109010855 | ND |
| 2021-09-01 | CA5010029_010_010-202109010815 | 0.420 ppb |
| 2021-10-06 | CA5010029_010_010-202110060830 | 0.570 ppb |
| 2021-10-06 | CA5010029_011_011-202110060900 | ND |
| 2021-11-03 | CA5010029_010_010-202111030930 | 0.470 ppb |
| 2021-11-03 | CA5010029_011_011-202111030905 | ND |
| 2021-11-03 | CA5010029_004_004-202111030845 | ND |
| 2021-12-01 | CA5010029_010_010-202112010920 | 0.350 ppb |
| 2021-12-01 | CA5010029_011_011-202112010900 | ND |
| 2022-01-05 | CA5010029_011_011-202201050828 | ND |
| 2022-01-05 | CA5010029_010_010-202201050802 | 0.390 ppb |
| 2022-02-02 | CA5010029_010_010-202202020915 | 0.320 ppb |
| 2022-02-02 | CA5010029_011_011-202202020950 | ND |
| 2022-03-02 | CA5010029_011_011-202203020840 | ND |
| 2022-03-02 | CA5010029_010_010-202203020855 | 0.400 ppb |
| 2022-04-06 | CA5010029_010_010-202204061000 | 0.0970 ppb |
| 2022-04-06 | CA5010029_011_011-202204061030 | ND |
| 2022-04-06 | CA5010029_002_002-202204061255 | ND |
| 2022-05-04 | CA5010029_011_011-202205040850 | ND |
| 2022-05-04 | CA5010029_010_010-202205040800 | 0.420 ppb |
| 2022-06-01 | CA5010029_011_011-202206010915 | ND |
| 2022-06-01 | CA5010029_010_010-202206010830 | 0.270 ppb |
| 2022-06-29 | CA5010029_004_004-202206290859 | 0.0820 ppb |
| 2022-07-05 | CA5010029_011_011-202207051310 | ND |
| 2022-07-05 | CA5010029_010_010-202207051230 | 0.150 ppb |
| 2022-08-03 | CA5010029_011_011-202208031105 | ND |
| 2022-08-03 | CA5010029_010_010-202208031025 | 0.280 ppb |
| 2022-09-06 | CA5010029_010_010-202209060950 | 0.350 ppb |
| 2022-09-06 | CA5010029_011_011-202209061030 | ND |
| 2022-10-05 | CA5010029_010_010-202210050900 | 0.310 ppb |
| 2022-10-05 | CA5010029_011_011-202210050930 | ND |
| 2022-11-02 | CA5010029_004_004-202211021000 | 0.1000 ppb |
| 2022-11-02 | CA5010029_010_010-202211021240 | 0.320 ppb |
| 2022-11-02 | CA5010029_011_011-202211021310 | ND |
| 2022-12-07 | CA5010029_011_011-202212070930 | ND |
| 2022-12-07 | CA5010029_010_010-202212070850 | 0.280 ppb |
| 2023-01-03 | CA5010029_011_011-202301031310 | ND |
| 2023-01-03 | CA5010029_010_010-202301031235 | ND |
| 2023-02-01 | CA5010029_011_011-202302011030 | ND |
| 2023-02-01 | CA5010029_010_010-202302010955 | ND |
| 2023-03-01 | CA5010029_011_011-202303011240 | ND |
| 2023-03-01 | CA5010029_010_010-202303011200 | ND |
| 2023-04-05 | CA5010029_010_010-202304050935 | ND |
| 2023-04-05 | CA5010029_002_002-202304050835 | ND |
| 2023-04-05 | CA5010029_011_011-202304051010 | ND |
| 2023-05-03 | CA5010029_010_010-202305030910 | ND |
| 2023-06-07 | CA5010029_010_010-202306070910 | 0.300 ppb |
| 2023-06-07 | CA5010029_011_011-202306070950 | ND |
| 2023-07-05 | CA5010029_010_010-202307050925 | 0.350 ppb |
| 2023-07-05 | CA5010029_011_011-202307051005 | ND |
| 2023-08-02 | CA5010029_010_010-202308020925 | 0.750 ppb |
| 2023-08-02 | CA5010029_011_011-202308021040 | ND |
| 2023-09-05 | CA5010029_011_011-202309051000 | ND |
| 2023-09-05 | CA5010029_010_010-202309050925 | 0.370 ppb |
| 2023-10-04 | CA5010029_010_010-202310040910 | ND |
| 2023-10-04 | CA5010029_011_011-202310040945 | ND |
| 2023-11-01 | CA5010029_010_010-202311010930 | ND |
| 2023-11-01 | CA5010029_004_004-202311010910 | ND |
| 2023-11-01 | CA5010029_011_011-202311011010 | ND |
| 2023-12-06 | CA5010029_010_010-202312060900 | ND |
| 2023-12-06 | CA5010029_001_001-202312060825 | ND |
| 2023-12-06 | CA5010029_011_011-202312060945 | ND |