Nitrate
Rehoboth Beach Water Department
Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 6.07 ppm | 42 | 42 | 3.20 ppm - 9.10 ppm |
2015 | 6.08 ppm | 41 | 41 | 3.70 ppm - 9.10 ppm |
2016 | 5.78 ppm | 40 | 40 | 3.30 ppm - 9.10 ppm |
2017 | 5.55 ppm | 52 | 52 | 3.60 ppm - 9.30 ppm |
2018 | 5.69 ppm | 48 | 48 | 3.35 ppm - 9.38 ppm |
2019 | 6.13 ppm | 42 | 42 | 2.73 ppm - 9.50 ppm |
ppm = parts per million
State and national drinking water standards and health guidelines
EWG Health Guideline 0.14 ppm
The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.
EPA Maximum Contaminant
Level (MCL) 10 ppm
The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.
ppm = parts per million
All test results
Date | Lab ID | Result |
---|---|---|
2014-01-14 | S457803 | 3.80 ppm |
2014-01-14 | S457804 | 8.70 ppm |
2014-01-14 | S457805 | 8.80 ppm |
2014-02-11 | S457813 | 5.40 ppm |
2014-02-11 | S457814 | 8.80 ppm |
2014-02-11 | S505443 | 3.20 ppm |
2014-03-11 | S505437 | 3.40 ppm |
2014-03-11 | S505438 | 5.50 ppm |
2014-03-11 | S505439 | 8.90 ppm |
2014-04-08 | S505446 | 3.50 ppm |
2014-04-08 | S505447 | 5.70 ppm |
2014-04-08 | S505448 | 9.10 ppm |
2014-05-20 | S505484 | 3.30 ppm |
2014-05-20 | S505485 | 5.40 ppm |
2014-05-20 | S505486 | 8.80 ppm |
2014-06-10 | S505526 | 3.50 ppm |
2014-06-10 | S505528 | 5.50 ppm |
2014-06-10 | S505529 | 9.00 ppm |
2014-07-15 | S505556 | 3.70 ppm |
2014-07-15 | S505557 | 5.40 ppm |
2014-07-15 | S505558 | 8.90 ppm |
2014-08-12 | S505722 | 3.80 ppm |
2014-08-12 | S505723 | 5.50 ppm |
2014-08-12 | S505724 | 9.10 ppm |
2014-09-09 | S505841 | 3.50 ppm |
2014-09-09 | S505842 | 8.70 ppm |
2014-09-09 | S505843 | 8.90 ppm |
2014-10-21 | S505886 | 3.50 ppm |
2014-10-21 | S505887 | 5.30 ppm |
2014-10-21 | S505888 | 8.90 ppm |
2014-11-25 | S505889 | 3.50 ppm |
2014-11-25 | S580056 | 8.60 ppm |
2014-11-25 | S580057 | 5.30 ppm |
2014-11-25 | S580060 | 4.10 ppm |
2014-12-10 | S588967 | 5.30 ppm |
2014-12-10 | S588968 | 5.50 ppm |
2014-12-10 | S588969 | 6.20 ppm |
2014-12-10 | S588976 | 8.60 ppm |
2014-12-23 | S580065 | 3.90 ppm |
2014-12-23 | S580066 | 5.40 ppm |
2014-12-23 | S580067 | 9.00 ppm |
2014-12-23 | S580074 | 4.20 ppm |
2015-01-27 | S580079 | 3.80 ppm |
2015-01-27 | S580081 | 5.40 ppm |
2015-01-27 | S580082 | 8.70 ppm |
2015-02-24 | S580095 | 4.00 ppm |
2015-02-24 | S580096 | 5.50 ppm |
2015-02-24 | S580097 | 9.10 ppm |
2015-03-24 | S580107 | 4.10 ppm |
2015-03-24 | S580108 | 5.20 ppm |
2015-03-24 | S580109 | 8.80 ppm |
2015-04-28 | S580122 | 3.80 ppm |
2015-04-28 | S580123 | 8.50 ppm |
2015-04-28 | S580124 | 8.50 ppm |
2015-05-26 | S580441 | 3.80 ppm |
2015-05-26 | S580442 | 8.40 ppm |
2015-05-26 | S580443 | 8.60 ppm |
2015-06-23 | S631702 | 3.80 ppm |
2015-06-23 | S631703 | 5.20 ppm |
2015-06-23 | S631704 | 8.70 ppm |
2015-07-21 | S631721 | 3.80 ppm |
2015-07-21 | S631722 | 5.20 ppm |
2015-07-21 | S631723 | 8.70 ppm |
2015-08-18 | S631778 | 3.80 ppm |
2015-08-18 | S631779 | 3.80 ppm |
2015-08-18 | S631780 | 5.30 ppm |
2015-08-18 | S631781 | 8.70 ppm |
2015-09-15 | S631823 | 3.90 ppm |
2015-09-15 | S631824 | 3.80 ppm |
2015-09-15 | S631825 | 7.60 ppm |
2015-09-15 | S631826 | 8.70 ppm |
2015-10-27 | S631882 | 3.90 ppm |
2015-10-27 | S631883 | 8.80 ppm |
2015-10-27 | S631884 | 8.80 ppm |
2015-10-27 | S631885 | 3.70 ppm |
2015-11-10 | S631892 | 3.80 ppm |
2015-11-10 | S631893 | 3.80 ppm |
2015-11-10 | S631894 | 5.30 ppm |
2015-11-10 | S631895 | 8.70 ppm |
2015-12-22 | S631919 | 3.80 ppm |
2015-12-22 | S631922 | 8.90 ppm |
2015-12-22 | S631923 | 8.80 ppm |
2015-12-22 | S631924 | 3.90 ppm |
2016-01-26 | S631930 | 3.70 ppm |
2016-01-26 | S631931 | 4.00 ppm |
2016-01-26 | S631932 | 5.60 ppm |
2016-01-26 | S631933 | 9.10 ppm |
2016-02-23 | S631945 | 5.30 ppm |
2016-02-23 | S631947 | 8.60 ppm |
2016-02-23 | S631950 | 3.80 ppm |
2016-03-08 | S631957 | 3.30 ppm |
2016-03-08 | S631959 | 8.70 ppm |
2016-03-22 | S631960 | 5.20 ppm |
2016-04-12 | S631969 | 3.80 ppm |
2016-04-12 | S631970 | 8.70 ppm |
2016-04-12 | S631971 | 8.70 ppm |
2016-05-17 | S631998 | 3.90 ppm |
2016-05-17 | S631999 | 3.80 ppm |
2016-05-17 | S632000 | 5.30 ppm |
2016-05-17 | S632001 | 8.70 ppm |
2016-06-21 | S696605 | 3.90 ppm |
2016-06-21 | S696606 | 3.80 ppm |
2016-06-21 | S696607 | 7.90 ppm |
2016-06-21 | S696608 | 8.70 ppm |
2016-07-19 | S696609 | 4.00 ppm |
2016-07-19 | S696610 | 3.90 ppm |
2016-07-19 | S696611 | 8.40 ppm |
2016-07-19 | S696612 | 8.80 ppm |
2016-08-16 | S696676 | 3.90 ppm |
2016-08-16 | S696677 | 3.80 ppm |
2016-08-16 | S696678 | 7.70 ppm |
2016-08-16 | S696679 | 8.70 ppm |
2016-09-20 | S696711 | 4.50 ppm |
2016-09-20 | S696712 | 3.70 ppm |
2016-09-20 | S696713 | 5.20 ppm |
2016-10-18 | S696746 | 4.30 ppm |
2016-10-18 | S696748 | 5.30 ppm |
2016-11-22 | S696753 | 3.80 ppm |
2016-11-22 | S696754 | 8.90 ppm |
2016-11-22 | S696755 | 4.30 ppm |
2016-12-13 | S696760 | 4.00 ppm |
2016-12-13 | S696761 | 9.10 ppm |
2016-12-13 | S696762 | 4.50 ppm |
2017-01-24 | S665273 | 4.50 ppm |
2017-01-24 | S665274 | 5.40 ppm |
2017-02-17 | S665286 | 4.40 ppm |
2017-02-17 | S665287 | 3.90 ppm |
2017-02-17 | S665288 | 3.90 ppm |
2017-02-17 | S665289 | 8.50 ppm |
2017-03-28 | S665296 | 8.80 ppm |
2017-03-28 | S665297 | 4.10 ppm |
2017-03-28 | S665298 | 4.50 ppm |
2017-03-28 | S665303 | 8.90 ppm |
2017-04-18 | S665317 | 4.40 ppm |
2017-04-25 | S665322 | 3.60 ppm |
2017-04-25 | S665323 | 3.90 ppm |
2017-04-25 | S665324 | 5.20 ppm |
2017-04-25 | S665325 | 8.50 ppm |
2017-05-16 | S665343 | 4.40 ppm |
2017-05-16 | S665344 | 4.00 ppm |
2017-05-16 | S665345 | 4.00 ppm |
2017-05-16 | S665346 | 8.60 ppm |
2017-06-20 | S665371 | 4.10 ppm |
2017-06-20 | S665372 | 5.40 ppm |
2017-06-20 | S665373 | 9.10 ppm |
2017-06-20 | S665374 | 4.60 ppm |
2017-07-18 | S732220 | 4.10 ppm |
2017-07-18 | S732221 | 4.00 ppm |
2017-07-18 | S732222 | 5.30 ppm |
2017-07-18 | S732223 | 9.10 ppm |
2017-08-15 | S732278 | 3.80 ppm |
2017-08-15 | S732279 | 4.00 ppm |
2017-08-15 | S732280 | 5.20 ppm |
2017-08-15 | S732281 | 9.00 ppm |
2017-09-19 | S740855 | 4.30 ppm |
2017-09-19 | S740856 | 4.10 ppm |
2017-09-19 | S740857 | 5.20 ppm |
2017-09-19 | S740858 | 9.00 ppm |
2017-09-26 | S740867 | 4.10 ppm |
2017-09-26 | S740868 | 9.10 ppm |
2017-10-24 | S750591 | 4.10 ppm |
2017-10-24 | S750592 | 4.10 ppm |
2017-10-24 | S750593 | 8.90 ppm |
2017-11-14 | S750424 | 4.00 ppm |
2017-11-14 | S750425 | 9.30 ppm |
2017-11-14 | S750426 | 4.20 ppm |
2017-11-14 | S750427 | 4.20 ppm |
2017-11-28 | S750608 | 3.70 ppm |
2017-11-28 | S750609 | 4.10 ppm |
2017-11-28 | S750610 | 5.20 ppm |
2017-11-28 | S750611 | 8.90 ppm |
2017-12-12 | S750602 | 3.60 ppm |
2017-12-12 | S750603 | 4.10 ppm |
2017-12-12 | S750612 | 4.10 ppm |
2017-12-12 | S750613 | 9.00 ppm |
2018-01-23 | S750623 | 3.40 ppm |
2018-01-23 | S750624 | 9.00 ppm |
2018-01-23 | S750625 | 5.20 ppm |
2018-01-23 | S750626 | 4.00 ppm |
2018-02-13 | S750618 | 4.10 ppm |
2018-02-13 | S750631 | 4.30 ppm |
2018-02-13 | S750632 | 4.30 ppm |
2018-02-13 | S750633 | 9.20 ppm |
2018-03-27 | S750650 | 4.00 ppm |
2018-03-27 | S750652 | 5.40 ppm |
2018-03-27 | S780651 | 4.30 ppm |
2018-04-24 | S750662 | 3.94 ppm |
2018-04-24 | S750663 | 4.27 ppm |
2018-04-24 | S750664 | 9.14 ppm |
2018-04-24 | S750665 | 9.17 ppm |
2018-05-22 | S750702 | 4.41 ppm |
2018-05-22 | S750703 | 4.37 ppm |
2018-05-22 | S750704 | 9.27 ppm |
2018-05-22 | S750705 | 9.29 ppm |
2018-06-26 | S750732 | 4.23 ppm |
2018-06-26 | S750733 | 4.38 ppm |
2018-06-26 | S750735 | 9.17 ppm |
2018-07-24 | S750754 | 4.17 ppm |
2018-07-24 | S750755 | 4.28 ppm |
2018-07-24 | S750756 | 5.06 ppm |
2018-07-24 | S750757 | 9.07 ppm |
2018-08-14 | S750773 | 3.95 ppm |
2018-08-14 | S750774 | 4.28 ppm |
2018-08-14 | S750775 | 5.08 ppm |
2018-08-14 | S750776 | 9.00 ppm |
2018-09-11 | S804467 | 4.28 ppm |
2018-09-11 | S804468 | 5.09 ppm |
2018-09-11 | S804469 | 9.00 ppm |
2018-09-11 | S804470 | 3.35 ppm |
2018-10-23 | S804527 | 4.02 ppm |
2018-10-23 | S804528 | 4.41 ppm |
2018-10-23 | S804529 | 5.36 ppm |
2018-11-13 | S804534 | 4.09 ppm |
2018-11-13 | S804535 | 4.37 ppm |
2018-11-13 | S804536 | 4.36 ppm |
2018-11-29 | S850887 | 4.60 ppm |
2018-11-29 | S850888 | 5.41 ppm |
2018-11-29 | S850889 | 4.42 ppm |
2018-11-29 | S850890 | 9.38 ppm |
2018-12-12 | S804548 | 4.23 ppm |
2018-12-12 | S804549 | 4.33 ppm |
2018-12-12 | S804550 | 9.37 ppm |
2018-12-12 | S804551 | 9.37 ppm |
2019-01-08 | S804542 | 3.55 ppm |
2019-01-08 | S804543 | 4.47 ppm |
2019-01-08 | S804544 | 4.49 ppm |
2019-01-08 | S804545 | 9.44 ppm |
2019-01-22 | S804563 | 9.15 ppm |
2019-01-22 | S804565 | 4.26 ppm |
2019-01-22 | S804566 | 4.02 ppm |
2019-02-26 | S804573 | 9.08 ppm |
2019-02-26 | S804574 | 4.04 ppm |
2019-02-26 | S804575 | 4.41 ppm |
2019-02-26 | S804576 | 5.39 ppm |
2019-03-26 | S804307 | 4.22 ppm |
2019-03-26 | S804590 | 9.36 ppm |
2019-03-26 | S804591 | 9.38 ppm |
2019-04-23 | S804327 | 3.52 ppm |
2019-04-23 | S804328 | 9.19 ppm |
2019-04-23 | S804329 | 9.19 ppm |
2019-05-21 | S804354 | 2.82 ppm |
2019-05-21 | S804355 | 5.04 ppm |
2019-05-21 | S804356 | 9.07 ppm |
2019-06-18 | S804364 | 8.96 ppm |
2019-06-18 | S804381 | 4.02 ppm |
2019-06-18 | S804382 | 5.02 ppm |
2019-07-16 | S804392 | 3.58 ppm |
2019-07-16 | S804393 | 4.99 ppm |
2019-07-16 | S804394 | 9.14 ppm |
2019-08-20 | S804155 | 2.73 ppm |
2019-08-20 | S804156 | 4.95 ppm |
2019-08-20 | S804157 | 9.03 ppm |
2019-09-24 | S804193 | 3.02 ppm |
2019-09-24 | S804194 | 5.14 ppm |
2019-09-24 | S804195 | 9.47 ppm |
2019-10-01 | S909990 | 5.19 ppm |
2019-10-01 | S909993 | 9.49 ppm |
2019-10-01 | S909996 | 3.71 ppm |
2019-10-29 | S925227 | 5.19 ppm |
2019-10-29 | S925246 | 3.68 ppm |
2019-11-18 | S925216 | 9.50 ppm |
2019-11-26 | S909896 | 4.09 ppm |
2019-11-26 | S909898 | 9.24 ppm |
2019-12-17 | S909904 | 4.01 ppm |
2019-12-17 | S909905 | 9.09 ppm |