Fluoride
Elsinore Valley Municipal Water District
Fluoride occurs naturally in surface and groundwater and is also added to drinking water by many water systems. Read More.
Fluoride has been promoted as a chemical that reduces dental cavities. Yet it is now well-established that fluoride primarily exerts its protective effects through topical mechanisms, such as sodium fluoride in toothpaste and mouthwash. In contrast, long-term ingestion of fluoride in water increases dental fluorosis, which includes mottling, pitting and weakening of the teeth. EPA's maximum legal limit is set at 4 parts per million (ppm) to prevent skeletal fluorosis, a condition where bones become brittle and more susceptible to fractures, although these effects may occur at lower doses.
Even fluoride levels of 0.7 ppm, the amount of fluoride in drinking water recommended by the U.S. Public Health Service, can result in too much fluoride for bottle-fed babies. EWG recommends that caregivers mix baby formula with fluoride-free water. The National Toxicology Program is investigating the potential for low doses of fluoride to alter thyroid function and childhood brain development.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 0.586 ppm | 7 | 7 | 0.200 ppm - 1.000 ppm |
| 2015 | 0.450 ppm | 10 | 10 | 0.200 ppm - 0.800 ppm |
| 2016 | 0.431 ppm | 13 | 13 | 0.200 ppm - 0.800 ppm |
| 2017 | 0.303 ppm | 3 | 3 | 0.180 ppm - 0.400 ppm |
| 2018 | 0.766 ppm | 8 | 8 | 0.160 ppm - 1.40 ppm |
| 2019 | 0.387 ppm | 28 | 28 | 0.120 ppm - 1.20 ppm |
ppm = parts per million
State and national drinking water standards and health guidelines
EPA Maximum Contaminant
Level (MCL) 4 ppm
ppm = parts per million
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-08-05 | 4790-004-1115 | 0.500 ppm |
| 2014-08-15 | 4790-040-0825 | 0.800 ppm |
| 2014-08-15 | 4790-021-0810 | 0.800 ppm |
| 2014-08-26 | 4790-022-1425 | 0.400 ppm |
| 2014-08-26 | 4790-010-1359 | 0.200 ppm |
| 2014-09-29 | 4790-002-0835 | 0.400 ppm |
| 2014-12-17 | 4790-040-1115 | 1.000 ppm |
| 2015-05-07 | 4790-038-1350 | 0.400 ppm |
| 2015-08-17 | 4790-037-1040 | 0.200 ppm |
| 2015-08-17 | 4790-007-1020 | 0.500 ppm |
| 2015-08-17 | 4790-022-1100 | 0.700 ppm |
| 2015-08-20 | 4790-010-1140 | 0.200 ppm |
| 2015-08-20 | 4790-031-1235 | 0.300 ppm |
| 2015-08-20 | 4790-012-1210 | 0.200 ppm |
| 2015-08-24 | 4790-004-1105 | 0.500 ppm |
| 2015-08-24 | 4790-040-1050 | 0.700 ppm |
| 2015-12-10 | 4790-040-1300 | 0.800 ppm |
| 2016-02-03 | 4790-050-1130 | 0.500 ppm |
| 2016-02-03 | 4790-049-1315 | 0.400 ppm |
| 2016-05-26 | 4790-052-1030 | 0.400 ppm |
| 2016-08-11 | 4790-037-1220 | 0.200 ppm |
| 2016-08-11 | 4790-010-1110 | 0.200 ppm |
| 2016-08-17 | 4790-012-1240 | 0.200 ppm |
| 2016-08-17 | 4790-031-1150 | 0.300 ppm |
| 2016-08-17 | 4790-040-1230 | 0.700 ppm |
| 2016-08-17 | 4790-022-1320 | 0.700 ppm |
| 2016-08-25 | 4790-004-1505 | 0.800 ppm |
| 2016-08-25 | 4790-007-1040 | 0.700 ppm |
| 2016-08-25 | 4790-053-0910 | 0.300 ppm |
| 2016-11-17 | 4790-038-1500 | 0.200 ppm |
| 2017-04-12 | 9590-052-1345 | 0.400 ppm |
| 2017-04-28 | 9590-002-1310 | 0.180 ppm |
| 2017-09-28 | 9590-038-1430 | 0.330 ppm |
| 2018-05-01 | 4790-038-1420 | 0.160 ppm |
| 2018-06-07 | 4790-002-1128 | 0.200 ppm |
| 2018-07-11 | 4790-022-1502 | 1.20 ppm |
| 2018-07-18 | 4790-021-1055 | 1.40 ppm |
| 2018-07-26 | 4790-049-1328 | 0.240 ppm |
| 2018-07-26 | 4790-050-1348 | 0.530 ppm |
| 2018-08-24 | 4790-040-0916 | 1.30 ppm |
| 2018-10-03 | 4790-021-1417 | 1.10 ppm |
| 2019-01-09 | 4790-012-1350 | 0.150 ppm |
| 2019-01-24 | 4790-053-0900 | 0.330 ppm |
| 2019-01-25 | 4790-053-0818 | 0.270 ppm |
| 2019-03-27 | 4790-038-1008 | 0.280 ppm |
| 2019-06-07 | 4790-052-1045 | 0.280 ppm |
| 2019-06-11 | 4790-053-1110 | 0.280 ppm |
| 2019-06-13 | 4790-012-0938 | 0.150 ppm |
| 2019-06-14 | 4790-043-0912 | 0.580 ppm |
| 2019-06-14 | 4790-033-0818 | 0.600 ppm |
| 2019-06-18 | 4790-037-1128 | 0.120 ppm |
| 2019-06-20 | 4790-031-1112 | 0.560 ppm |
| 2019-06-25 | 4790-021-1245 | 1.20 ppm |
| 2019-06-25 | 4790-050-1230 | 0.380 ppm |
| 2019-06-25 | 4790-049-1200 | 0.230 ppm |
| 2019-06-25 | 4790-022-1148 | 0.320 ppm |
| 2019-08-08 | 4790-050-1121 | 0.400 ppm |
| 2019-08-08 | 4790-049-1128 | 0.240 ppm |
| 2019-08-14 | 4790-043-1505 | 0.510 ppm |
| 2019-08-19 | 4790-002-1345 | 0.140 ppm |
| 2019-08-28 | 4790-052-1510 | 0.340 ppm |
| 2019-08-28 | 4790-053-1150 | 0.330 ppm |
| 2019-08-28 | 4790-062-1417 | 0.680 ppm |
| 2019-08-28 | 4790-033-1343 | 0.730 ppm |
| 2019-09-05 | 4790-007-1110 | 0.770 ppm |
| 2019-09-12 | 4790-038-1250 | 0.290 ppm |
| 2019-11-12 | 4790-004-1255 | 0.370 ppm |
| 2019-12-17 | 4790-010-1306 | 0.150 ppm |
| 2019-12-18 | 4790-010-1306 | 0.150 ppm |