Fluoride
Sun Prairie Utilities
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.
298
Samples
0
Samples exceeding legal limit (MCL)
0
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 | 0.605 ppm | 55 | 55 | 0.0920 ppm - 0.753 ppm |
| 2015 | 0.659 ppm | 48 | 48 | 0.580 ppm - 0.790 ppm |
| 2016 | 0.659 ppm | 48 | 48 | 0.553 ppm - 0.741 ppm |
| 2017 | 0.663 ppm | 55 | 55 | 0.140 ppm - 0.870 ppm |
| 2018 | 0.651 ppm | 48 | 48 | 0.509 ppm - 0.764 ppm |
| 2019 | 0.644 ppm | 44 | 44 | 0.505 ppm - 0.780 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 |
|---|---|---|
| 2014-01-07 | 115100001 | 0.591 ppm |
| 2014-01-07 | 115100001 | 0.630 ppm |
| 2014-01-07 | 115099001 | 0.700 ppm |
| 2014-01-07 | 115099001 | 0.704 ppm |
| 2014-02-03 | 118034001 | 0.626 ppm |
| 2014-02-03 | 118034001 | 0.660 ppm |
| 2014-02-03 | 118033001 | 0.668 ppm |
| 2014-02-03 | 118033001 | 0.710 ppm |
| 2014-03-03 | 121317001 | 0.675 ppm |
| 2014-03-03 | 121317001 | 0.680 ppm |
| 2014-03-03 | 121318001 | 0.681 ppm |
| 2014-03-03 | 121318001 | 0.720 ppm |
| 2014-03-18 | 775341 | 0.0920 ppm |
| 2014-03-18 | 775338 | 0.0960 ppm |
| 2014-03-18 | 775332 | 0.0980 ppm |
| 2014-03-18 | 775335 | 0.0980 ppm |
| 2014-03-18 | 775329 | 0.110 ppm |
| 2014-03-18 | 775283 | 0.160 ppm |
| 2014-03-18 | 775327 | 0.680 ppm |
| 2014-04-14 | 127392001 | 0.630 ppm |
| 2014-04-14 | 127392001 | 0.642 ppm |
| 2014-04-14 | 127391001 | 0.652 ppm |
| 2014-04-14 | 127391001 | 0.720 ppm |
| 2014-05-05 | 130156001 | 0.635 ppm |
| 2014-05-05 | 130157001 | 0.660 ppm |
| 2014-05-05 | 130157001 | 0.668 ppm |
| 2014-05-05 | 130156001 | 0.690 ppm |
| 2014-06-09 | 137548001 | 0.642 ppm |
| 2014-06-09 | 137549001 | 0.670 ppm |
| 2014-06-09 | 137549001 | 0.690 ppm |
| 2014-06-09 | 137548001 | 0.740 ppm |
| 2014-07-07 | 143100001 | 0.600 ppm |
| 2014-07-07 | 143099001 | 0.600 ppm |
| 2014-07-07 | 143100001 | 0.627 ppm |
| 2014-07-07 | 143099001 | 0.632 ppm |
| 2014-08-18 | 151693001 | 0.630 ppm |
| 2014-08-18 | 151692001 | 0.640 ppm |
| 2014-08-18 | 151692001 | 0.647 ppm |
| 2014-08-18 | 151693001 | 0.661 ppm |
| 2014-09-15 | 156880001 | 0.640 ppm |
| 2014-09-15 | 156880001 | 0.646 ppm |
| 2014-09-15 | 156884001 | 0.670 ppm |
| 2014-09-15 | 156884001 | 0.678 ppm |
| 2014-10-15 | 163874001 | 0.600 ppm |
| 2014-10-15 | 163875001 | 0.640 ppm |
| 2014-10-15 | 163875001 | 0.708 ppm |
| 2014-10-15 | 163874001 | 0.713 ppm |
| 2014-11-03 | 166390001 | 0.670 ppm |
| 2014-11-03 | 166390001 | 0.677 ppm |
| 2014-11-03 | 166389001 | 0.690 ppm |
| 2014-11-03 | 166389001 | 0.753 ppm |
| 2014-12-01 | 170182001 | 0.655 ppm |
| 2014-12-01 | 170182001 | 0.660 ppm |
| 2014-12-01 | 170181001 | 0.705 ppm |
| 2014-12-01 | 170181001 | 0.710 ppm |
| 2015-01-20 | 176179001 | 0.610 ppm |
| 2015-01-20 | 176179001 | 0.658 ppm |
| 2015-01-20 | 176178001 | 0.660 ppm |
| 2015-01-20 | 176178001 | 0.683 ppm |
| 2015-02-03 | 177993001 | 0.600 ppm |
| 2015-02-03 | 177993001 | 0.615 ppm |
| 2015-02-03 | 177994001 | 0.620 ppm |
| 2015-02-03 | 177994001 | 0.669 ppm |
| 2015-03-09 | 182358001 | 0.620 ppm |
| 2015-03-09 | 182357001 | 0.620 ppm |
| 2015-03-09 | 182357001 | 0.705 ppm |
| 2015-03-09 | 182358001 | 0.706 ppm |
| 2015-04-21 | 188972001 | 0.580 ppm |
| 2015-04-21 | 188969001 | 0.600 ppm |
| 2015-04-21 | 188972001 | 0.668 ppm |
| 2015-04-21 | 188969001 | 0.673 ppm |
| 2015-05-04 | 190757001 | 0.588 ppm |
| 2015-05-04 | 190757001 | 0.620 ppm |
| 2015-05-04 | 190759001 | 0.650 ppm |
| 2015-05-04 | 190759001 | 0.681 ppm |
| 2015-06-01 | 196470001 | 0.610 ppm |
| 2015-06-01 | 196470001 | 0.674 ppm |
| 2015-06-01 | 196469001 | 0.720 ppm |
| 2015-06-01 | 196469001 | 0.755 ppm |
| 2015-07-14 | 205369001 | 0.580 ppm |
| 2015-07-14 | 205370001 | 0.600 ppm |
| 2015-07-14 | 205369001 | 0.666 ppm |
| 2015-07-14 | 205370001 | 0.710 ppm |
| 2015-08-10 | 210501001 | 0.630 ppm |
| 2015-08-10 | 210502001 | 0.634 ppm |
| 2015-08-10 | 210502001 | 0.640 ppm |
| 2015-08-10 | 210501001 | 0.679 ppm |
| 2015-09-01 | 214709001 | 0.641 ppm |
| 2015-09-01 | 214707001 | 0.694 ppm |
| 2015-09-01 | 214709001 | 0.740 ppm |
| 2015-09-01 | 214707001 | 0.790 ppm |
| 2015-10-13 | 223325001 | 0.600 ppm |
| 2015-10-13 | 223325001 | 0.616 ppm |
| 2015-10-13 | 223324001 | 0.689 ppm |
| 2015-10-13 | 223324001 | 0.720 ppm |
| 2015-11-02 | 226301001 | 0.612 ppm |
| 2015-11-02 | 226302001 | 0.670 ppm |
| 2015-11-02 | 226302001 | 0.693 ppm |
| 2015-11-02 | 226301001 | 0.700 ppm |
| 2015-12-01 | 230381001 | 0.632 ppm |
| 2015-12-01 | 230380001 | 0.690 ppm |
| 2015-12-01 | 230381001 | 0.690 ppm |
| 2015-12-01 | 230380001 | 0.710 ppm |
| 2016-01-12 | 235632001 | 0.617 ppm |
| 2016-01-12 | 235632001 | 0.630 ppm |
| 2016-01-12 | 235631001 | 0.650 ppm |
| 2016-01-12 | 235631001 | 0.688 ppm |
| 2016-02-01 | 237659001 | 0.628 ppm |
| 2016-02-01 | 237658001 | 0.640 ppm |
| 2016-02-01 | 237659001 | 0.660 ppm |
| 2016-02-01 | 237658001 | 0.728 ppm |
| 2016-03-14 | 243691001 | 0.624 ppm |
| 2016-03-14 | 243691001 | 0.680 ppm |
| 2016-03-21 | 244777001 | 0.660 ppm |
| 2016-03-21 | 244777001 | 0.705 ppm |
| 2016-04-04 | 246397001 | 0.611 ppm |
| 2016-04-04 | 246398001 | 0.650 ppm |
| 2016-04-04 | 246398001 | 0.681 ppm |
| 2016-04-04 | 246397001 | 0.690 ppm |
| 2016-05-17 | 254847001 | 0.620 ppm |
| 2016-05-17 | 254847001 | 0.630 ppm |
| 2016-05-17 | 254845001 | 0.640 ppm |
| 2016-05-17 | 254845001 | 0.648 ppm |
| 2016-06-13 | 259653001 | 0.692 ppm |
| 2016-06-13 | 259653001 | 0.700 ppm |
| 2016-06-13 | 259652001 | 0.700 ppm |
| 2016-06-13 | 259652001 | 0.740 ppm |
| 2016-07-05 | 263703001 | 0.557 ppm |
| 2016-07-05 | 263703001 | 0.620 ppm |
| 2016-07-05 | 263701001 | 0.659 ppm |
| 2016-07-05 | 263701001 | 0.660 ppm |
| 2016-08-23 | 273561001 | 0.553 ppm |
| 2016-08-23 | 273561001 | 0.600 ppm |
| 2016-08-23 | 273560001 | 0.600 ppm |
| 2016-08-23 | 273560001 | 0.691 ppm |
| 2016-09-06 | 275431001 | 0.555 ppm |
| 2016-09-06 | 275431001 | 0.630 ppm |
| 2016-09-06 | 275432001 | 0.690 ppm |
| 2016-09-06 | 275432001 | 0.700 ppm |
| 2016-10-03 | 281411001 | 0.654 ppm |
| 2016-10-03 | 281410001 | 0.655 ppm |
| 2016-10-03 | 281411001 | 0.700 ppm |
| 2016-10-03 | 281410001 | 0.720 ppm |
| 2016-11-08 | 287903001 | 0.600 ppm |
| 2016-11-08 | 287902001 | 0.673 ppm |
| 2016-11-08 | 287902001 | 0.720 ppm |
| 2016-11-08 | 287903001 | 0.741 ppm |
| 2016-12-13 | 292715001 | 0.636 ppm |
| 2016-12-13 | 292716001 | 0.657 ppm |
| 2016-12-13 | 292716001 | 0.730 ppm |
| 2016-12-13 | 292715001 | 0.740 ppm |
| 2017-01-03 | 294568001 | 0.681 ppm |
| 2017-01-03 | 294567001 | 0.697 ppm |
| 2017-01-03 | 294568001 | 0.740 ppm |
| 2017-01-03 | 294567001 | 0.780 ppm |
| 2017-02-14 | 299948001 | 0.672 ppm |
| 2017-02-14 | 299948001 | 0.710 ppm |
| 2017-02-14 | 299947001 | 0.713 ppm |
| 2017-02-14 | 299947001 | 0.720 ppm |
| 2017-03-06 | 302283001 | 0.640 ppm |
| 2017-03-06 | 302283001 | 0.675 ppm |
| 2017-03-06 | 302282001 | 0.688 ppm |
| 2017-03-06 | 302282001 | 0.710 ppm |
| 2017-04-03 | 307155001 | 0.650 ppm |
| 2017-04-03 | 307155001 | 0.715 ppm |
| 2017-04-10 | 308601001 | 0.670 ppm |
| 2017-04-10 | 308601001 | 0.677 ppm |
| 2017-04-26 | 985420 | 0.140 ppm |
| 2017-04-26 | 985416 | 0.160 ppm |
| 2017-04-26 | 985427 | 0.430 ppm |
| 2017-04-26 | 985414 | 0.650 ppm |
| 2017-04-26 | 985407 | 0.660 ppm |
| 2017-04-26 | 985411 | 0.660 ppm |
| 2017-04-26 | 985424 | 0.730 ppm |
| 2017-05-17 | 316491001 | 0.510 ppm |
| 2017-05-17 | 316492001 | 0.580 ppm |
| 2017-05-17 | 316491001 | 0.679 ppm |
| 2017-05-17 | 316492001 | 0.683 ppm |
| 2017-06-06 | 319852001 | 0.610 ppm |
| 2017-06-06 | 319852001 | 0.697 ppm |
| 2017-06-06 | 319851001 | 0.770 ppm |
| 2017-06-06 | 319851001 | 0.815 ppm |
| 2017-07-05 | 325894001 | 0.600 ppm |
| 2017-07-05 | 325895001 | 0.650 ppm |
| 2017-07-05 | 325894001 | 0.680 ppm |
| 2017-07-05 | 325895001 | 0.693 ppm |
| 2017-08-15 | 335749001 | 0.646 ppm |
| 2017-08-15 | 335750001 | 0.714 ppm |
| 2017-08-15 | 335749001 | 0.860 ppm |
| 2017-08-15 | 335750001 | 0.870 ppm |
| 2017-09-05 | 339557001 | 0.538 ppm |
| 2017-09-05 | 339556001 | 0.660 ppm |
| 2017-09-05 | 339557001 | 0.660 ppm |
| 2017-09-05 | 339556001 | 0.732 ppm |
| 2017-10-10 | 347781001 | 0.661 ppm |
| 2017-10-10 | 347781001 | 0.690 ppm |
| 2017-10-10 | 347782001 | 0.700 ppm |
| 2017-10-10 | 347782001 | 0.740 ppm |
| 2017-11-13 | 353921001 | 0.670 ppm |
| 2017-11-13 | 353921001 | 0.698 ppm |
| 2017-11-13 | 353922001 | 0.699 ppm |
| 2017-11-13 | 353922001 | 0.730 ppm |
| 2017-12-12 | 358892001 | 0.635 ppm |
| 2017-12-12 | 358893001 | 0.640 ppm |
| 2017-12-12 | 358893001 | 0.685 ppm |
| 2017-12-12 | 358892001 | 0.710 ppm |
| 2018-01-16 | 362822001 | 0.600 ppm |
| 2018-01-16 | 362823001 | 0.610 ppm |
| 2018-01-16 | 362823001 | 0.618 ppm |
| 2018-01-16 | 362822001 | 0.619 ppm |
| 2018-02-12 | 366373001 | 0.587 ppm |
| 2018-02-12 | 366373001 | 0.650 ppm |
| 2018-02-12 | 366374001 | 0.678 ppm |
| 2018-02-12 | 366374001 | 0.740 ppm |
| 2018-03-13 | 370824001 | 0.620 ppm |
| 2018-03-13 | 370823001 | 0.680 ppm |
| 2018-03-13 | 370824001 | 0.702 ppm |
| 2018-03-13 | 370823001 | 0.764 ppm |
| 2018-04-02 | 373797001 | 0.640 ppm |
| 2018-04-02 | 373797001 | 0.726 ppm |
| 2018-04-10 | 375474001 | 0.630 ppm |
| 2018-04-10 | 375474001 | 0.700 ppm |
| 2018-05-07 | 380067001 | 0.600 ppm |
| 2018-05-07 | 380068001 | 0.610 ppm |
| 2018-05-07 | 380067001 | 0.625 ppm |
| 2018-05-07 | 380068001 | 0.700 ppm |
| 2018-06-12 | 387957001 | 0.623 ppm |
| 2018-06-12 | 387956001 | 0.639 ppm |
| 2018-06-12 | 387957001 | 0.660 ppm |
| 2018-06-12 | 387956001 | 0.720 ppm |
| 2018-07-02 | 391872001 | 0.610 ppm |
| 2018-07-02 | 391873001 | 0.660 ppm |
| 2018-07-02 | 391872001 | 0.668 ppm |
| 2018-07-02 | 391873001 | 0.748 ppm |
| 2018-08-27 | 403358001 | 0.665 ppm |
| 2018-08-27 | 403359001 | 0.690 ppm |
| 2018-08-27 | 403359001 | 0.691 ppm |
| 2018-08-27 | 403358001 | 0.700 ppm |
| 2018-09-04 | 404668001 | 0.616 ppm |
| 2018-09-04 | 404668001 | 0.640 ppm |
| 2018-09-04 | 404666001 | 0.687 ppm |
| 2018-09-04 | 404666001 | 0.710 ppm |
| 2018-10-01 | 411386001 | 0.509 ppm |
| 2018-10-01 | 411386001 | 0.620 ppm |
| 2018-10-01 | 411387001 | 0.630 ppm |
| 2018-10-01 | 411387001 | 0.649 ppm |
| 2018-11-05 | 417657001 | 0.518 ppm |
| 2018-11-05 | 417656001 | 0.620 ppm |
| 2018-11-05 | 417657001 | 0.630 ppm |
| 2018-11-05 | 417656001 | 0.652 ppm |
| 2018-12-04 | 422409001 | 0.625 ppm |
| 2018-12-04 | 422408001 | 0.650 ppm |
| 2018-12-04 | 422409001 | 0.660 ppm |
| 2018-12-04 | 422408001 | 0.675 ppm |
| 2019-01-07 | 426239001 | 0.505 ppm |
| 2019-01-07 | 426237001 | 0.670 ppm |
| 2019-01-07 | 426237001 | 0.677 ppm |
| 2019-01-07 | 426239001 | 0.680 ppm |
| 2019-02-05 | 430069001 | 0.579 ppm |
| 2019-02-05 | 430068001 | 0.630 ppm |
| 2019-02-05 | 430068001 | 0.640 ppm |
| 2019-02-05 | 430069001 | 0.650 ppm |
| 2019-03-04 | 433427001 | 0.634 ppm |
| 2019-03-04 | 433427001 | 0.660 ppm |
| 2019-03-04 | 433428001 | 0.680 ppm |
| 2019-03-04 | 433428001 | 0.701 ppm |
| 2019-05-06 | 443808001 | 0.532 ppm |
| 2019-05-06 | 443809001 | 0.617 ppm |
| 2019-05-06 | 443808001 | 0.630 ppm |
| 2019-05-06 | 443809001 | 0.780 ppm |
| 2019-06-04 | 449469001 | 0.615 ppm |
| 2019-06-04 | 449470001 | 0.622 ppm |
| 2019-06-04 | 449470001 | 0.720 ppm |
| 2019-06-04 | 449469001 | 0.740 ppm |
| 2019-07-01 | 454802001 | 0.620 ppm |
| 2019-07-01 | 454800001 | 0.690 ppm |
| 2019-07-01 | 454800001 | 0.715 ppm |
| 2019-07-01 | 454802001 | 0.721 ppm |
| 2019-08-05 | 461203001 | 0.630 ppm |
| 2019-08-05 | 461203001 | 0.638 ppm |
| 2019-08-05 | 461205001 | 0.680 ppm |
| 2019-08-05 | 461205001 | 0.717 ppm |
| 2019-09-03 | 467006001 | 0.560 ppm |
| 2019-09-03 | 467005001 | 0.580 ppm |
| 2019-09-03 | 467006001 | 0.590 ppm |
| 2019-09-03 | 467005001 | 0.603 ppm |
| 2019-10-01 | 473530001 | 0.520 ppm |
| 2019-10-01 | 473531001 | 0.580 ppm |
| 2019-10-01 | 473530001 | 0.597 ppm |
| 2019-10-01 | 473531001 | 0.661 ppm |
| 2019-11-04 | 479292001 | 0.570 ppm |
| 2019-11-04 | 479292001 | 0.631 ppm |
| 2019-11-04 | 479291001 | 0.640 ppm |
| 2019-11-04 | 479291001 | 0.701 ppm |
| 2019-12-02 | 483666001 | 0.630 ppm |
| 2019-12-02 | 483666001 | 0.697 ppm |
| 2019-12-02 | 483665001 | 0.703 ppm |
| 2019-12-02 | 483665001 | 0.710 ppm |