Nitrate and nitrite
New York City System
Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.
340
Samples
0
Samples exceeding legal limit (MCL)
128
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 | 0.169 ppm | 40 | 40 | 0.104 ppm - 0.255 ppm |
| 2015 | 0.218 ppm | 53 | 53 | 0.0980 ppm - 0.545 ppm |
| 2016 | 0.153 ppm | 60 | 60 | 0.0457 ppm - 0.446 ppm |
| 2017 | 0.110 ppm | 60 | 60 | 0.0570 ppm - 0.325 ppm |
| 2018 | 0.136 ppm | 63 | 63 | 0.0590 ppm - 0.467 ppm |
| 2019 | 0.168 ppm | 64 | 64 | 0.0680 ppm - 0.522 ppm |
ppm = parts per million
State and national drinking water standards and health guidelines
EWG Health Guideline 0.14 ppm
The health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.
EPA Maximum Contaminant
Level (MCL) 10 ppm
ppm = parts per million
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-01-07 | 439 | 0.194 ppm |
| 2014-01-07 | 437 | 0.160 ppm |
| 2014-01-07 | 438 | 0.158 ppm |
| 2014-02-04 | 2711 | 0.183 ppm |
| 2014-02-04 | 2712 | 0.183 ppm |
| 2014-02-04 | 2710 | 0.180 ppm |
| 2014-02-04 | 2713 | 0.181 ppm |
| 2014-03-05 | 5074 | 0.255 ppm |
| 2014-03-05 | 5075 | 0.246 ppm |
| 2014-03-05 | 5073 | 0.243 ppm |
| 2014-04-01 | 7303 | 0.233 ppm |
| 2014-04-01 | 7305 | 0.214 ppm |
| 2014-04-01 | 7304 | 0.227 ppm |
| 2014-05-06 | 10218 | 0.210 ppm |
| 2014-05-06 | 10221 | 0.207 ppm |
| 2014-05-06 | 10220 | 0.247 ppm |
| 2014-05-06 | 10219 | 0.206 ppm |
| 2014-06-03 | 12553 | 0.175 ppm |
| 2014-06-03 | 12554 | 0.174 ppm |
| 2014-06-03 | 12555 | 0.173 ppm |
| 2014-07-08 | 15903 | 0.144 ppm |
| 2014-07-08 | 15905 | 0.145 ppm |
| 2014-07-08 | 15904 | 0.152 ppm |
| 2014-08-05 | 18379 | 0.151 ppm |
| 2014-08-05 | 18382 | 0.144 ppm |
| 2014-08-05 | 18380 | 0.151 ppm |
| 2014-08-05 | 18381 | 0.141 ppm |
| 2014-09-09 | 21341 | 0.159 ppm |
| 2014-09-09 | 21340 | 0.160 ppm |
| 2014-09-09 | 21339 | 0.171 ppm |
| 2014-10-07 | 23781 | 0.127 ppm |
| 2014-10-07 | 23780 | 0.117 ppm |
| 2014-10-07 | 23779 | 0.128 ppm |
| 2014-11-05 | 26217 | 0.115 ppm |
| 2014-11-05 | 26216 | 0.104 ppm |
| 2014-11-05 | 26215 | 0.130 ppm |
| 2014-11-05 | 26214 | 0.123 ppm |
| 2014-12-02 | 28269 | 0.112 ppm |
| 2014-12-02 | 28268 | 0.112 ppm |
| 2014-12-02 | 28270 | 0.112 ppm |
| 2015-01-06 | 341 | 0.175 ppm |
| 2015-01-06 | 340 | 0.177 ppm |
| 2015-01-06 | 339 | 0.180 ppm |
| 2015-02-04 | 2736 | 0.180 ppm |
| 2015-02-04 | 2739 | 0.180 ppm |
| 2015-02-04 | 2737 | 0.180 ppm |
| 2015-02-04 | 2738 | 0.180 ppm |
| 2015-03-03 | 4872 | 0.219 ppm |
| 2015-03-03 | 4874 | 0.220 ppm |
| 2015-03-03 | 4873 | 0.220 ppm |
| 2015-04-07 | 7757 | 0.265 ppm |
| 2015-04-07 | 7755 | 0.267 ppm |
| 2015-04-07 | 7756 | 0.263 ppm |
| 2015-05-01 | 9862 | 0.213 ppm |
| 2015-05-01 | 9863 | 0.211 ppm |
| 2015-05-01 | 9864 | 0.212 ppm |
| 2015-05-01 | 9861 | 0.215 ppm |
| 2015-05-05 | 10215 | 0.517 ppm |
| 2015-06-02 | 12726 | 0.197 ppm |
| 2015-06-02 | 12727 | 0.448 ppm |
| 2015-06-02 | 12725 | 0.198 ppm |
| 2015-06-02 | 12724 | 0.197 ppm |
| 2015-06-02 | 12728 | 0.199 ppm |
| 2015-07-07 | 16185 | 0.230 ppm |
| 2015-07-07 | 16183 | 0.231 ppm |
| 2015-07-07 | 16182 | 0.228 ppm |
| 2015-07-07 | 16184 | 0.420 ppm |
| 2015-07-07 | 16181 | 0.232 ppm |
| 2015-08-04 | 18861 | 0.207 ppm |
| 2015-08-04 | 18860 | 0.440 ppm |
| 2015-08-04 | 18858 | 0.208 ppm |
| 2015-08-04 | 18859 | 0.204 ppm |
| 2015-08-04 | 18857 | 0.204 ppm |
| 2015-09-02 | 21699 | 0.111 ppm |
| 2015-09-02 | 21703 | 0.113 ppm |
| 2015-09-02 | 21702 | 0.461 ppm |
| 2015-09-02 | 21701 | 0.111 ppm |
| 2015-09-02 | 21700 | 0.105 ppm |
| 2015-10-07 | 25088 | 0.540 ppm |
| 2015-10-07 | 25085 | 0.121 ppm |
| 2015-10-07 | 25084 | 0.137 ppm |
| 2015-10-07 | 25087 | 0.545 ppm |
| 2015-10-07 | 25086 | 0.133 ppm |
| 2015-11-04 | 27784 | 0.184 ppm |
| 2015-11-04 | 27712 | 0.116 ppm |
| 2015-11-04 | 27787 | 0.115 ppm |
| 2015-11-04 | 27788 | 0.1000 ppm |
| 2015-11-04 | 27783 | 0.0980 ppm |
| 2015-12-01 | 30250 | 0.122 ppm |
| 2015-12-01 | 30252 | 0.116 ppm |
| 2015-12-01 | 30253 | 0.175 ppm |
| 2015-12-01 | 30251 | 0.110 ppm |
| 2015-12-01 | 30254 | 0.111 ppm |
| 2016-01-06 | 33338 | 0.274 ppm |
| 2016-01-06 | 33339 | 0.289 ppm |
| 2016-01-06 | 33337 | 0.122 ppm |
| 2016-01-06 | 33335 | 0.123 ppm |
| 2016-01-06 | 33336 | 0.119 ppm |
| 2016-02-02 | 35940 | 0.275 ppm |
| 2016-02-02 | 35937 | 0.124 ppm |
| 2016-02-02 | 35938 | 0.125 ppm |
| 2016-02-02 | 35939 | 0.125 ppm |
| 2016-02-02 | 35941 | 0.124 ppm |
| 2016-03-01 | 38627 | 0.129 ppm |
| 2016-03-01 | 38623 | 0.128 ppm |
| 2016-03-01 | 38624 | 0.128 ppm |
| 2016-03-01 | 38626 | 0.310 ppm |
| 2016-03-01 | 38625 | 0.129 ppm |
| 2016-04-05 | 42187 | 0.105 ppm |
| 2016-04-05 | 42188 | 0.103 ppm |
| 2016-04-05 | 42191 | 0.406 ppm |
| 2016-04-05 | 42189 | 0.104 ppm |
| 2016-04-05 | 42190 | 0.404 ppm |
| 2016-05-03 | 45115 | 0.1000 ppm |
| 2016-05-03 | 45114 | 0.0990 ppm |
| 2016-05-03 | 45116 | 0.446 ppm |
| 2016-05-03 | 45117 | 0.445 ppm |
| 2016-05-03 | 45113 | 0.101 ppm |
| 2016-06-07 | 48494 | 0.1000 ppm |
| 2016-06-07 | 48496 | 0.101 ppm |
| 2016-06-07 | 48492 | 0.101 ppm |
| 2016-06-07 | 48495 | 0.320 ppm |
| 2016-06-07 | 48493 | 0.0960 ppm |
| 2016-07-12 | 52407 | 0.113 ppm |
| 2016-07-12 | 52408 | 0.112 ppm |
| 2016-07-12 | 52406 | 0.110 ppm |
| 2016-07-12 | 52410 | 0.113 ppm |
| 2016-07-12 | 52409 | 0.436 ppm |
| 2016-08-09 | 55665 | 0.354 ppm |
| 2016-08-09 | 55666 | 0.0748 ppm |
| 2016-08-09 | 55663 | 0.0763 ppm |
| 2016-08-09 | 55664 | 0.0784 ppm |
| 2016-08-09 | 55662 | 0.0768 ppm |
| 2016-09-07 | 58760 | 0.145 ppm |
| 2016-09-07 | 58762 | 0.146 ppm |
| 2016-09-07 | 58763 | 0.149 ppm |
| 2016-09-07 | 58761 | 0.148 ppm |
| 2016-09-07 | 58764 | 0.147 ppm |
| 2016-10-05 | 61747 | 0.0457 ppm |
| 2016-10-05 | 61750 | 0.0512 ppm |
| 2016-10-05 | 61749 | 0.0503 ppm |
| 2016-10-05 | 61746 | 0.0510 ppm |
| 2016-10-05 | 61748 | 0.0505 ppm |
| 2016-11-01 | 64457 | 0.0727 ppm |
| 2016-11-01 | 64453 | 0.0757 ppm |
| 2016-11-01 | 64456 | 0.249 ppm |
| 2016-11-01 | 64454 | 0.0739 ppm |
| 2016-11-01 | 64455 | 0.0766 ppm |
| 2016-12-06 | 67872 | 0.0945 ppm |
| 2016-12-06 | 67865 | 0.139 ppm |
| 2016-12-06 | 67871 | 0.0945 ppm |
| 2016-12-06 | 67866 | 0.139 ppm |
| 2016-12-06 | 67813 | 0.0944 ppm |
| 2017-01-04 | 386 | 0.110 ppm |
| 2017-01-04 | 388 | 0.103 ppm |
| 2017-01-04 | 389 | 0.104 ppm |
| 2017-01-04 | 391 | 0.193 ppm |
| 2017-01-04 | 390 | 0.193 ppm |
| 2017-02-07 | 3706 | 0.116 ppm |
| 2017-02-07 | 3703 | 0.130 ppm |
| 2017-02-07 | 3707 | 0.325 ppm |
| 2017-02-07 | 3708 | 0.319 ppm |
| 2017-02-07 | 3704 | 0.133 ppm |
| 2017-02-07 | 3705 | 0.115 ppm |
| 2017-03-07 | 6307 | 0.116 ppm |
| 2017-03-07 | 6310 | 0.115 ppm |
| 2017-03-07 | 6308 | 0.115 ppm |
| 2017-03-07 | 6309 | 0.116 ppm |
| 2017-03-07 | 6305 | 0.114 ppm |
| 2017-04-04 | 8976 | 0.142 ppm |
| 2017-04-04 | 8979 | 0.147 ppm |
| 2017-04-04 | 8978 | 0.136 ppm |
| 2017-04-04 | 8980 | 0.137 ppm |
| 2017-04-04 | 8981 | 0.134 ppm |
| 2017-05-02 | 11734 | 0.109 ppm |
| 2017-05-02 | 11731 | 0.110 ppm |
| 2017-05-02 | 11732 | 0.104 ppm |
| 2017-05-02 | 11730 | 0.109 ppm |
| 2017-05-02 | 11733 | 0.109 ppm |
| 2017-05-02 | 11735 | 0.109 ppm |
| 2017-06-06 | 15121 | 0.0940 ppm |
| 2017-06-06 | 15124 | 0.0970 ppm |
| 2017-06-06 | 15125 | 0.0960 ppm |
| 2017-06-06 | 15126 | 0.0940 ppm |
| 2017-06-06 | 15123 | 0.0920 ppm |
| 2017-07-05 | 18091 | 0.0930 ppm |
| 2017-07-05 | 18092 | 0.0940 ppm |
| 2017-07-05 | 18089 | 0.0950 ppm |
| 2017-07-05 | 18090 | 0.0950 ppm |
| 2017-07-05 | 18087 | 0.0950 ppm |
| 2017-08-01 | 21342 | 0.128 ppm |
| 2017-08-01 | 21335 | 0.150 ppm |
| 2017-09-06 | 25073 | 0.110 ppm |
| 2017-09-06 | 25071 | 0.103 ppm |
| 2017-09-06 | 25074 | 0.1000 ppm |
| 2017-09-06 | 25072 | 0.109 ppm |
| 2017-09-06 | 25069 | 0.109 ppm |
| 2017-10-04 | 28088 | 0.0670 ppm |
| 2017-10-04 | 28092 | 0.0670 ppm |
| 2017-10-04 | 28090 | 0.0570 ppm |
| 2017-10-04 | 28091 | 0.0660 ppm |
| 2017-10-04 | 28093 | 0.0670 ppm |
| 2017-11-08 | 31824 | 0.0660 ppm |
| 2017-11-08 | 31825 | 0.0670 ppm |
| 2017-11-08 | 31827 | 0.0650 ppm |
| 2017-11-08 | 31822 | 0.0670 ppm |
| 2017-11-08 | 31823 | 0.0680 ppm |
| 2017-11-08 | 31826 | 0.0650 ppm |
| 2017-12-05 | 34541 | 0.0740 ppm |
| 2017-12-05 | 34543 | 0.0710 ppm |
| 2017-12-05 | 34542 | 0.0730 ppm |
| 2017-12-05 | 34544 | 0.0730 ppm |
| 2017-12-05 | 34539 | 0.0740 ppm |
| 2018-01-03 | 217 | 0.118 ppm |
| 2018-01-03 | 220 | 0.126 ppm |
| 2018-01-03 | 331 | 0.127 ppm |
| 2018-01-03 | 219 | 0.125 ppm |
| 2018-02-06 | 3725 | 0.118 ppm |
| 2018-02-06 | 3726 | 0.121 ppm |
| 2018-02-06 | 3727 | 0.117 ppm |
| 2018-02-06 | 3723 | 0.117 ppm |
| 2018-02-06 | 3724 | 0.116 ppm |
| 2018-02-06 | 3722 | 0.116 ppm |
| 2018-03-06 | 6557 | 0.145 ppm |
| 2018-03-06 | 6558 | 0.146 ppm |
| 2018-03-06 | 6553 | 0.149 ppm |
| 2018-03-06 | 6556 | 0.148 ppm |
| 2018-03-06 | 6555 | 0.145 ppm |
| 2018-04-03 | 9460 | 0.131 ppm |
| 2018-04-03 | 9463 | 0.134 ppm |
| 2018-04-03 | 9464 | 0.131 ppm |
| 2018-04-03 | 9465 | 0.131 ppm |
| 2018-04-03 | 9462 | 0.132 ppm |
| 2018-05-01 | 12598 | 0.122 ppm |
| 2018-05-01 | 12601 | 0.122 ppm |
| 2018-05-01 | 12597 | 0.121 ppm |
| 2018-05-01 | 12599 | 0.118 ppm |
| 2018-05-01 | 12600 | 0.122 ppm |
| 2018-05-01 | 12602 | 0.120 ppm |
| 2018-06-05 | 16474 | 0.314 ppm |
| 2018-06-05 | 16472 | 0.0940 ppm |
| 2018-06-05 | 16475 | 0.0940 ppm |
| 2018-06-05 | 16470 | 0.0940 ppm |
| 2018-06-05 | 16473 | 0.0950 ppm |
| 2018-07-10 | 20630 | 0.127 ppm |
| 2018-07-10 | 20633 | 0.123 ppm |
| 2018-07-10 | 20628 | 0.122 ppm |
| 2018-07-10 | 20632 | 0.467 ppm |
| 2018-07-10 | 20631 | 0.120 ppm |
| 2018-08-07 | 23702 | 0.124 ppm |
| 2018-08-07 | 23705 | 0.108 ppm |
| 2018-08-07 | 23700 | 0.118 ppm |
| 2018-08-07 | 23707 | 0.467 ppm |
| 2018-08-07 | 23703 | 0.109 ppm |
| 2018-08-07 | 23709 | 0.107 ppm |
| 2018-09-05 | 26847 | 0.102 ppm |
| 2018-09-05 | 26871 | 0.106 ppm |
| 2018-09-05 | 26848 | 0.103 ppm |
| 2018-09-05 | 26812 | 0.101 ppm |
| 2018-09-05 | 26811 | 0.102 ppm |
| 2018-10-03 | 29853 | 0.0850 ppm |
| 2018-10-03 | 29854 | 0.107 ppm |
| 2018-10-03 | 29869 | 0.0790 ppm |
| 2018-10-03 | 29870 | 0.0790 ppm |
| 2018-10-03 | 29920 | 0.110 ppm |
| 2018-11-07 | 33737 | 0.0600 ppm |
| 2018-11-07 | 33666 | 0.0620 ppm |
| 2018-11-07 | 33665 | 0.0610 ppm |
| 2018-11-07 | 33664 | 0.0630 ppm |
| 2018-11-07 | 33688 | 0.0590 ppm |
| 2018-11-07 | 33738 | 0.245 ppm |
| 2018-12-04 | 36315 | 0.112 ppm |
| 2018-12-04 | 36335 | 0.352 ppm |
| 2018-12-04 | 36302 | 0.109 ppm |
| 2018-12-04 | 36314 | 0.112 ppm |
| 2018-12-04 | 36336 | 0.351 ppm |
| 2019-01-02 | 132 | 0.394 ppm |
| 2019-01-02 | 131 | 0.387 ppm |
| 2019-01-02 | 182 | 0.118 ppm |
| 2019-01-02 | 137 | 0.116 ppm |
| 2019-01-02 | 138 | 0.118 ppm |
| 2019-02-05 | 3651 | 0.119 ppm |
| 2019-02-05 | 3637 | 0.509 ppm |
| 2019-02-05 | 3638 | 0.509 ppm |
| 2019-02-05 | 3650 | 0.118 ppm |
| 2019-02-05 | 3587 | 0.120 ppm |
| 2019-02-05 | 3649 | 0.121 ppm |
| 2019-03-05 | 6428 | 0.516 ppm |
| 2019-03-05 | 6435 | 0.127 ppm |
| 2019-03-05 | 6444 | 0.133 ppm |
| 2019-03-05 | 6429 | 0.522 ppm |
| 2019-03-05 | 6434 | 0.125 ppm |
| 2019-04-02 | 9215 | 0.101 ppm |
| 2019-04-02 | 9265 | 0.0990 ppm |
| 2019-04-02 | 9276 | 0.1000 ppm |
| 2019-04-02 | 9214 | 0.102 ppm |
| 2019-04-02 | 9264 | 0.0990 ppm |
| 2019-05-07 | 12968 | 0.177 ppm |
| 2019-05-07 | 12936 | 0.176 ppm |
| 2019-05-07 | 12935 | 0.176 ppm |
| 2019-05-07 | 12918 | 0.176 ppm |
| 2019-05-07 | 12969 | 0.448 ppm |
| 2019-05-07 | 12937 | 0.178 ppm |
| 2019-06-04 | 15851 | 0.0910 ppm |
| 2019-06-04 | 15875 | 0.118 ppm |
| 2019-06-04 | 15869 | 0.128 ppm |
| 2019-06-04 | 15868 | 0.120 ppm |
| 2019-06-04 | 15874 | 0.113 ppm |
| 2019-07-02 | 18962 | 0.131 ppm |
| 2019-07-02 | 18961 | 0.159 ppm |
| 2019-07-02 | 18974 | 0.148 ppm |
| 2019-07-02 | 19008 | 0.136 ppm |
| 2019-07-02 | 18973 | 0.160 ppm |
| 2019-08-06 | 22813 | 0.140 ppm |
| 2019-08-06 | 22851 | 0.138 ppm |
| 2019-08-06 | 22818 | 0.140 ppm |
| 2019-08-06 | 22853 | 0.139 ppm |
| 2019-08-06 | 22852 | 0.139 ppm |
| 2019-08-06 | 22812 | 0.140 ppm |
| 2019-09-04 | 25962 | 0.147 ppm |
| 2019-09-04 | 25974 | 0.143 ppm |
| 2019-09-04 | 25973 | 0.145 ppm |
| 2019-09-04 | 26009 | 0.146 ppm |
| 2019-09-04 | 26008 | 0.156 ppm |
| 2019-10-01 | 28907 | 0.129 ppm |
| 2019-10-01 | 28906 | 0.123 ppm |
| 2019-10-01 | 28877 | 0.131 ppm |
| 2019-10-01 | 28900 | 0.128 ppm |
| 2019-10-01 | 28901 | 0.131 ppm |
| 2019-11-06 | 32973 | 0.0700 ppm |
| 2019-11-06 | 32986 | 0.0680 ppm |
| 2019-11-06 | 32961 | 0.105 ppm |
| 2019-11-06 | 32960 | 0.105 ppm |
| 2019-11-06 | 32972 | 0.0700 ppm |
| 2019-11-06 | 32974 | 0.0720 ppm |
| 2019-12-03 | 35799 | 0.157 ppm |
| 2019-12-03 | 35850 | 0.155 ppm |
| 2019-12-03 | 35845 | 0.204 ppm |
| 2019-12-03 | 35851 | 0.148 ppm |
| 2019-12-03 | 35844 | 0.205 ppm |