Nitrate
City Of Waterford
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.
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 | 3.55 ppm | 66 | 66 | 1.74 ppm - 5.68 ppm |
| 2019 | 3.63 ppm | 51 | 51 | 2.03 ppm - 4.65 ppm |
| 2020 | 4.03 ppm | 27 | 27 | 2.19 ppm - 4.85 ppm |
| 2021 | 3.93 ppm | 27 | 27 | 2.40 ppm - 4.54 ppm |
| 2022 | 4.06 ppm | 25 | 25 | 2.97 ppm - 4.99 ppm |
| 2023 | 4.13 ppm | 33 | 33 | 2.75 ppm - 5.59 ppm |
ppm = parts per million
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.14 ppm
The EWG 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
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 |
|---|---|---|
| 2018-01-03 | CA5010006_012_012-201801031035 | 3.85 ppm |
| 2018-01-17 | CA5010006_006_006-201801171205 | 3.61 ppm |
| 2018-01-17 | CA5010006_012_012-201801171240 | 3.63 ppm |
| 2018-01-24 | CA5010006_012_012-201801241011 | 3.62 ppm |
| 2018-01-31 | CA5010006_012_012-201801311023 | 3.61 ppm |
| 2018-02-07 | CA5010006_012_012-201802070945 | 3.49 ppm |
| 2018-02-14 | CA5010006_012_012-201802140950 | 3.65 ppm |
| 2018-02-21 | CA5010006_012_012-201802211046 | 3.70 ppm |
| 2018-02-21 | CA5010006_006_006-201802211037 | 3.68 ppm |
| 2018-02-28 | CA5010006_012_012-201802280918 | 3.73 ppm |
| 2018-03-07 | CA5010006_012_012-201803070900 | 3.60 ppm |
| 2018-03-14 | CA5010006_012_012-201803141029 | 3.65 ppm |
| 2018-03-22 | CA5010006_006_006-201803220959 | 5.68 ppm |
| 2018-03-22 | CA5010006_012_012-201803221009 | 3.92 ppm |
| 2018-03-28 | CA5010006_012_012-201803280855 | 3.60 ppm |
| 2018-04-04 | CA5010006_012_012-201804040937 | 3.63 ppm |
| 2018-04-11 | CA5010006_012_012-201804111129 | 3.62 ppm |
| 2018-04-18 | CA5010006_006_006-201804180815 | 3.56 ppm |
| 2018-04-18 | CA5010006_012_012-201804180829 | 3.55 ppm |
| 2018-04-25 | CA5010006_012_012-201804250807 | 3.53 ppm |
| 2018-05-02 | CA5010006_012_012-201805021100 | 3.59 ppm |
| 2018-05-09 | CA5010006_012_012-201805090830 | 3.54 ppm |
| 2018-05-16 | CA5010006_006_006-201805160813 | 3.53 ppm |
| 2018-05-16 | CA5010006_012_012-201805160822 | 3.59 ppm |
| 2018-05-23 | CA5010006_012_012-201805230755 | 3.45 ppm |
| 2018-05-31 | CA5010006_012_012-201805311206 | 3.46 ppm |
| 2018-06-06 | CA5010006_012_012-201806061148 | 3.49 ppm |
| 2018-06-13 | CA5010006_012_012-201806131117 | 3.58 ppm |
| 2018-06-20 | CA5010006_012_012-201806201125 | 3.60 ppm |
| 2018-06-20 | CA5010006_006_006-201806201106 | 3.47 ppm |
| 2018-06-27 | CA5010006_012_012-201806270808 | 3.52 ppm |
| 2018-07-03 | CA5010006_012_012-201807031015 | 3.49 ppm |
| 2018-07-11 | CA5010006_012_012-201807111407 | 3.58 ppm |
| 2018-07-18 | CA5010006_004_004-201807181140 | 3.81 ppm |
| 2018-07-18 | CA5010006_001_001-201807181240 | 3.87 ppm |
| 2018-07-18 | CA5010006_005_005-201807181045 | 1.74 ppm |
| 2018-07-18 | CA5010006_006_006-201807181313 | 3.48 ppm |
| 2018-07-18 | CA5010006_012_012-201807181332 | 3.47 ppm |
| 2018-07-26 | CA5010006_012_012-201807260930 | 3.60 ppm |
| 2018-08-01 | CA5010006_012_012-201808011138 | 3.37 ppm |
| 2018-08-08 | CA5010006_012_012-201808081115 | 3.50 ppm |
| 2018-08-15 | CA5010006_012_012-201808150921 | 3.36 ppm |
| 2018-08-15 | CA5010006_006_006-201808150908 | 3.39 ppm |
| 2018-08-22 | CA5010006_012_012-201808221037 | 3.35 ppm |
| 2018-08-29 | CA5010006_012_012-201808290936 | 3.73 ppm |
| 2018-09-05 | CA5010006_012_012-201809051144 | 3.41 ppm |
| 2018-09-12 | CA5010006_012_012-201809121227 | 3.40 ppm |
| 2018-09-18 | CA5010006_006_006-201809180849 | 3.46 ppm |
| 2018-09-18 | CA5010006_012_012-201809180912 | 3.50 ppm |
| 2018-09-26 | CA5010006_012_012-201809261040 | 3.34 ppm |
| 2018-10-04 | CA5010006_012_012-201810041009 | 3.34 ppm |
| 2018-10-11 | CA5010006_012_012-201810111145 | 3.40 ppm |
| 2018-10-17 | CA5010006_006_006-201810171015 | 3.54 ppm |
| 2018-10-17 | CA5010006_012_012-201810171025 | 3.60 ppm |
| 2018-10-24 | CA5010006_012_012-201810241020 | 3.67 ppm |
| 2018-10-31 | CA5010006_012_012-201810311345 | 3.48 ppm |
| 2018-11-07 | CA5010006_012_012-201811071135 | 3.69 ppm |
| 2018-11-14 | CA5010006_012_012-201811141100 | 3.64 ppm |
| 2018-11-19 | CA5010006_006_006-201811191142 | 3.51 ppm |
| 2018-11-19 | CA5010006_012_012-201811191150 | 3.40 ppm |
| 2018-11-28 | CA5010006_012_012-201811281304 | 3.39 ppm |
| 2018-12-05 | CA5010006_006_006-201812051105 | 3.46 ppm |
| 2018-12-11 | CA5010006_012_012-201812111115 | 3.48 ppm |
| 2018-12-19 | CA5010006_006_006-201812191140 | 3.35 ppm |
| 2018-12-19 | CA5010006_012_012-201812191150 | 3.32 ppm |
| 2018-12-26 | CA5010006_012_012-201812260857 | 3.29 ppm |
| 2019-01-02 | CA5010006_012_012-201901021019 | 3.51 ppm |
| 2019-01-09 | CA5010006_012_012-201901090930 | 3.51 ppm |
| 2019-01-16 | CA5010006_012_012-201901161115 | 3.57 ppm |
| 2019-01-16 | CA5010006_006_006-201901161108 | 3.50 ppm |
| 2019-01-23 | CA5010006_012_012-201901230830 | 3.65 ppm |
| 2019-01-30 | CA5010006_012_012-201901301025 | 3.35 ppm |
| 2019-02-06 | CA5010006_012_012-201902061145 | 3.64 ppm |
| 2019-02-13 | CA5010006_012_012-201902131210 | 3.56 ppm |
| 2019-02-20 | CA5010006_006_006-201902201100 | 3.77 ppm |
| 2019-02-20 | CA5010006_012_012-201902201110 | 3.78 ppm |
| 2019-02-25 | CA5010006_012_012-201902250835 | 3.62 ppm |
| 2019-03-04 | CA5010006_012_012-201903040930 | 3.76 ppm |
| 2019-03-13 | CA5010006_012_012-201903130820 | 3.46 ppm |
| 2019-03-18 | CA5010006_006_006-201903181030 | 3.63 ppm |
| 2019-03-18 | CA5010006_012_012-201903181035 | 3.58 ppm |
| 2019-03-26 | CA5010006_012_012-201903261040 | 3.67 ppm |
| 2019-04-03 | CA5010006_012_012-201904030850 | 3.48 ppm |
| 2019-04-10 | CA5010006_012_012-201904101135 | 3.54 ppm |
| 2019-04-17 | CA5010006_012_012-201904171010 | 3.56 ppm |
| 2019-04-17 | CA5010006_006_006-201904171000 | 3.54 ppm |
| 2019-04-24 | CA5010006_012_012-201904240805 | 3.44 ppm |
| 2019-05-01 | CA5010006_012_012-201905011105 | 3.46 ppm |
| 2019-05-08 | CA5010006_012_012-201905080850 | 3.45 ppm |
| 2019-05-15 | CA5010006_006_006-201905150835 | 3.61 ppm |
| 2019-05-15 | CA5010006_012_012-201905150845 | 3.60 ppm |
| 2019-05-22 | CA5010006_012_012-201905220815 | 3.94 ppm |
| 2019-05-29 | CA5010006_012_012-201905290825 | 3.65 ppm |
| 2019-06-05 | CA5010006_012_012-201906050855 | 3.83 ppm |
| 2019-06-12 | CA5010006_012_012-201906120815 | 3.95 ppm |
| 2019-06-19 | CA5010006_006_006-201906190915 | 3.55 ppm |
| 2019-06-19 | CA5010006_012_012-201906190925 | 3.50 ppm |
| 2019-06-26 | CA5010006_012_012-201906260940 | 3.48 ppm |
| 2019-07-03 | CA5010006_012_012-201907031100 | 3.56 ppm |
| 2019-07-09 | CA5010006_012_012-201907091000 | 3.63 ppm |
| 2019-07-17 | CA5010006_004_004-201907171210 | 4.65 ppm |
| 2019-07-17 | CA5010006_005_005-201907171114 | 2.03 ppm |
| 2019-07-17 | CA5010006_006_006-201907171027 | 3.56 ppm |
| 2019-07-17 | CA5010006_012_012-201907171037 | 3.84 ppm |
| 2019-07-17 | CA5010006_001_001-201907171127 | 3.90 ppm |
| 2019-07-22 | CA5010006_012_012-201907220905 | 3.51 ppm |
| 2019-07-31 | CA5010006_012_012-201907310810 | 3.72 ppm |
| 2019-08-20 | CA5010006_012_012-201908200825 | 3.96 ppm |
| 2019-08-20 | CA5010006_006_006-201908200820 | 3.77 ppm |
| 2019-09-18 | CA5010006_012_012-201909181055 | 3.85 ppm |
| 2019-09-18 | CA5010006_006_006-201909181050 | 3.71 ppm |
| 2019-10-15 | CA5010006_006_006-201910151115 | 3.63 ppm |
| 2019-10-15 | CA5010006_012_012-201910151120 | 3.66 ppm |
| 2019-11-18 | CA5010006_006_006-201911180950 | 4.09 ppm |
| 2019-11-18 | CA5010006_012_012-201911181005 | 3.62 ppm |
| 2019-12-18 | CA5010006_006_006-201912180830 | 3.56 ppm |
| 2019-12-18 | CA5010006_012_012-201912180850 | 3.91 ppm |
| 2020-01-15 | CA5010006_006_006-202001150920 | 3.78 ppm |
| 2020-01-15 | CA5010006_012_012-202001150925 | 3.75 ppm |
| 2020-02-19 | CA5010006_012_012-202002190850 | 4.03 ppm |
| 2020-02-19 | CA5010006_006_006-202002190835 | 4.28 ppm |
| 2020-03-18 | CA5010006_006_006-202003181025 | 4.70 ppm |
| 2020-03-18 | CA5010006_012_012-202003181035 | 4.70 ppm |
| 2020-04-15 | CA5010006_006_006-202004151035 | 3.96 ppm |
| 2020-04-15 | CA5010006_012_012-202004151045 | 3.93 ppm |
| 2020-05-20 | CA5010006_012_012-202005200910 | 3.78 ppm |
| 2020-05-20 | CA5010006_006_006-202005200855 | 3.89 ppm |
| 2020-06-17 | CA5010006_006_006-202006171100 | 2.88 ppm |
| 2020-06-17 | CA5010006_012_012-202006171110 | 3.75 ppm |
| 2020-07-15 | CA5010006_004_004-202007151040 | 4.26 ppm |
| 2020-07-15 | CA5010006_005_005-202007151015 | 2.19 ppm |
| 2020-07-15 | CA5010006_006_006-202007150925 | 4.31 ppm |
| 2020-07-15 | CA5010006_012_012-202007150935 | 4.39 ppm |
| 2020-07-15 | CA5010006_001_001-202007151110 | 4.20 ppm |
| 2020-08-20 | CA5010006_012_012-202008200935 | 3.84 ppm |
| 2020-08-20 | CA5010006_006_006-202008200920 | 3.87 ppm |
| 2020-09-16 | CA5010006_012_012-202009161150 | 4.57 ppm |
| 2020-09-16 | CA5010006_006_006-202009161130 | 4.85 ppm |
| 2020-10-20 | CA5010006_006_006-202010201100 | 3.98 ppm |
| 2020-10-20 | CA5010006_012_012-202010201115 | 3.92 ppm |
| 2020-11-18 | CA5010006_012_012-202011181155 | 4.39 ppm |
| 2020-11-18 | CA5010006_006_006-202011181135 | 4.56 ppm |
| 2020-12-16 | CA5010006_012_012-202012161000 | 4.26 ppm |
| 2020-12-16 | CA5010006_006_006-202012160950 | 3.83 ppm |
| 2021-01-20 | CA5010006_006_006-202101200900 | 3.79 ppm |
| 2021-01-20 | CA5010006_012_012-202101200915 | 3.85 ppm |
| 2021-02-17 | CA5010006_006_006-202102170920 | 3.92 ppm |
| 2021-02-17 | CA5010006_012_012-20210217NUL | 3.99 ppm |
| 2021-03-17 | CA5010006_006_006-202103171122 | 3.96 ppm |
| 2021-03-17 | CA5010006_012_012-202103171133 | 4.04 ppm |
| 2021-04-21 | CA5010006_012_012-202104211000 | 3.63 ppm |
| 2021-04-21 | CA5010006_006_006-202104210955 | 2.58 ppm |
| 2021-05-19 | CA5010006_006_006-202105190945 | 3.78 ppm |
| 2021-05-19 | CA5010006_012_012-202105190945 | 3.68 ppm |
| 2021-06-16 | CA5010006_006_006-202106161225 | 3.75 ppm |
| 2021-06-16 | CA5010006_012_012-202106161220 | 3.89 ppm |
| 2021-07-20 | CA5010006_001_001-202107201250 | 4.28 ppm |
| 2021-07-20 | CA5010006_005_005-202107201110 | 2.40 ppm |
| 2021-07-20 | CA5010006_006_006-202107201315 | 4.23 ppm |
| 2021-07-20 | CA5010006_012_012-202107201325 | 3.86 ppm |
| 2021-07-20 | CA5010006_004_004-202107201140 | 4.54 ppm |
| 2021-08-18 | CA5010006_012_012-202108181134 | 4.19 ppm |
| 2021-08-18 | CA5010006_006_006-202108181205 | 4.17 ppm |
| 2021-09-21 | CA5010006_012_012-202109211112 | 4.40 ppm |
| 2021-09-21 | CA5010006_006_006-202109211056 | 4.40 ppm |
| 2021-10-19 | CA5010006_012_012-202110190923 | 4.13 ppm |
| 2021-10-19 | CA5010006_006_006-202110190925 | 4.14 ppm |
| 2021-11-16 | CA5010006_006_006-202111161125 | 4.50 ppm |
| 2021-11-16 | CA5010006_012_012-202111161135 | 4.50 ppm |
| 2021-12-21 | CA5010006_006_006-202112210935 | 3.80 ppm |
| 2021-12-21 | CA5010006_012_012-202112210945 | 3.80 ppm |
| 2022-01-18 | CA5010006_006_006-202201181145 | 3.99 ppm |
| 2022-01-18 | CA5010006_012_012-202201181150 | 3.87 ppm |
| 2022-02-15 | CA5010006_012_012-202202151306 | 4.11 ppm |
| 2022-02-15 | CA5010006_006_006-202202151259 | 4.12 ppm |
| 2022-03-01 | CA5010006_012_012-202203011028 | 4.40 ppm |
| 2022-03-01 | CA5010006_006_006-202203011025 | 4.40 ppm |
| 2022-04-06 | CA5010006_012_012-202204061246 | 4.11 ppm |
| 2022-04-06 | CA5010006_006_006-202204061241 | 4.11 ppm |
| 2022-05-03 | CA5010006_006_006-202205031238 | 4.03 ppm |
| 2022-05-03 | CA5010006_012_012-202205031241 | 4.01 ppm |
| 2022-06-07 | CA5010006_006_006-202206071417 | 3.96 ppm |
| 2022-06-07 | CA5010006_012_012-202206071422 | 3.95 ppm |
| 2022-07-05 | CA5010006_006_006-202207051227 | 4.00 ppm |
| 2022-07-05 | CA5010006_012_012-202207051229 | 4.00 ppm |
| 2022-08-04 | CA5010006_012_012-202208041340 | 4.33 ppm |
| 2022-08-04 | CA5010006_006_006-202208041335 | 4.31 ppm |
| 2022-09-06 | CA5010006_006_006-202209061040 | 3.80 ppm |
| 2022-09-06 | CA5010006_012_012-202209061045 | 3.81 ppm |
| 2022-10-04 | CA5010006_012_012-202210041310 | 4.06 ppm |
| 2022-10-04 | CA5010006_006_006-202210041300 | 4.04 ppm |
| 2022-11-01 | CA5010006_006_006-202211010835 | 4.09 ppm |
| 2022-11-01 | CA5010006_012_012-202211010845 | 4.13 ppm |
| 2022-12-01 | CA5010006_004_004-202212011105 | 4.99 ppm |
| 2022-12-01 | CA5010006_005_005-202212010940 | 2.97 ppm |
| 2022-12-01 | CA5010006_001_001-202212011145 | 3.93 ppm |
| 2023-01-03 | CA5010006_006_006-202301030830 | 4.17 ppm |
| 2023-01-03 | CA5010006_012_012-202301030840 | 4.19 ppm |
| 2023-02-07 | CA5010006_012_012-202302071005 | 4.16 ppm |
| 2023-02-07 | CA5010006_006_006-202302070946 | 4.16 ppm |
| 2023-02-22 | CA5010006_002_002-202302221355 | 4.04 ppm |
| 2023-02-22 | CA5010006_004_004-202302221318 | 5.59 ppm |
| 2023-02-22 | CA5010006_005_005-202302221325 | 2.92 ppm |
| 2023-02-22 | CA5010006_006_006-202302221340 | 4.22 ppm |
| 2023-02-22 | CA5010006_001_001-202302221331 | 4.18 ppm |
| 2023-03-07 | CA5010006_006_006-202303071120 | 4.15 ppm |
| 2023-03-07 | CA5010006_012_012-202303071125 | 4.14 ppm |
| 2023-04-04 | CA5010006_006_006-202304040910 | 4.14 ppm |
| 2023-04-04 | CA5010006_012_012-202304040920 | 4.12 ppm |
| 2023-05-02 | CA5010006_012_012-202305020910 | 4.17 ppm |
| 2023-05-02 | CA5010006_006_006-202305020905 | 4.22 ppm |
| 2023-05-17 | CA5010006_005_005-202305170950 | 2.75 ppm |
| 2023-05-17 | CA5010006_006_006-202305171020 | 4.10 ppm |
| 2023-05-17 | CA5010006_001_001-202305171010 | 4.30 ppm |
| 2023-05-17 | CA5010006_002_002-202305171210 | 5.29 ppm |
| 2023-06-06 | CA5010006_012_012-202306061023 | 4.14 ppm |
| 2023-06-06 | CA5010006_006_006-202306061016 | 4.13 ppm |
| 2023-07-05 | CA5010006_012_012-202307050834 | 4.09 ppm |
| 2023-07-05 | CA5010006_006_006-202307050826 | 4.05 ppm |
| 2023-08-01 | CA5010006_012_012-202308011414 | 4.06 ppm |
| 2023-08-01 | CA5010006_006_006-202308011410 | 4.08 ppm |
| 2023-09-12 | CA5010006_012_012-202309120707 | 4.08 ppm |
| 2023-09-12 | CA5010006_006_006-202309120703 | 4.08 ppm |
| 2023-10-04 | CA5010006_006_006-202310040935 | 4.12 ppm |
| 2023-10-04 | CA5010006_012_012-202310041000 | 4.10 ppm |
| 2023-11-07 | CA5010006_006_006-202311071027 | 4.10 ppm |
| 2023-11-07 | CA5010006_012_012-202311071033 | 4.04 ppm |
| 2023-12-12 | CA5010006_006_006-202312120854 | 4.13 ppm |
| 2023-12-12 | CA5010006_012_012-202312120859 | 4.17 ppm |