Nitrate and nitrite
City of Fresno
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.
228
Samples
1
Samples exceeding legal limit (MCL)
216
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 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | 3.20 ppm | 220 | 208 | ND - 16.0 ppm |
| 2018 | 2.95 ppm | 4 | 4 | 0.710 ppm - 5.30 ppm |
| 2019 | 2.50 ppm | 4 | 4 | 1.30 ppm - 4.50 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 |
|---|---|---|
| 2017-01-10 | 5810-153-1130 | 5.30 ppm |
| 2017-01-10 | 5810-718-1225 | 5.60 ppm |
| 2017-01-11 | 5810-137-1400 | 5.50 ppm |
| 2017-01-11 | 5810-295-0830 | 3.90 ppm |
| 2017-01-11 | 5810-342-0915 | 4.10 ppm |
| 2017-01-11 | 5810-347-1325 | 2.80 ppm |
| 2017-01-11 | 5810-591-0950 | 5.40 ppm |
| 2017-01-12 | 5810-192-0830 | 1.80 ppm |
| 2017-01-12 | 5810-192-0915 | 1.60 ppm |
| 2017-01-12 | 5810-236-1115 | 6.30 ppm |
| 2017-01-12 | 5810-343-1230 | 4.20 ppm |
| 2017-01-12 | 5810-563-1045 | 6.10 ppm |
| 2017-01-12 | 5810-679-1330 | 2.90 ppm |
| 2017-01-13 | 5810-146-1225 | 7.00 ppm |
| 2017-01-13 | 5810-310-1500 | 4.50 ppm |
| 2017-01-13 | 5810-346-1340 | 3.80 ppm |
| 2017-01-13 | 5810-396-1300 | 6.20 ppm |
| 2017-01-13 | 5810-398-1050 | 3.80 ppm |
| 2017-01-13 | 5810-630-0900 | 3.30 ppm |
| 2017-01-13 | 5810-693-0955 | 4.50 ppm |
| 2017-01-13 | 5810-721-1555 | 2.40 ppm |
| 2017-01-24 | 5810-125-1200 | 3.50 ppm |
| 2017-01-24 | 5810-136-1310 | 2.00 ppm |
| 2017-01-24 | 5810-143-1015 | 2.40 ppm |
| 2017-01-24 | 5810-194-1345 | 3.40 ppm |
| 2017-01-24 | 5810-200-1420 | 3.40 ppm |
| 2017-01-24 | 5810-611-1235 | 2.50 ppm |
| 2017-01-24 | 5810-721-1115 | 2.40 ppm |
| 2017-01-25 | 5810-130-1145 | 7.70 ppm |
| 2017-01-25 | 5810-280-1030 | 3.10 ppm |
| 2017-01-25 | 5810-294-0830 | 5.30 ppm |
| 2017-01-25 | 5810-368-0915 | 6.20 ppm |
| 2017-01-25 | 5810-395-1000 | 1.80 ppm |
| 2017-01-25 | 5810-614-1100 | 1.10 ppm |
| 2017-01-25 | 5810-646-1220 | 0.600 ppm |
| 2017-01-26 | 5810-163-1300 | 3.60 ppm |
| 2017-01-26 | 5810-298-1215 | 5.10 ppm |
| 2017-01-26 | 5810-367-1025 | 3.10 ppm |
| 2017-01-26 | 5810-591-0930 | 5.30 ppm |
| 2017-01-26 | 5810-703-1345 | 2.60 ppm |
| 2017-01-27 | 5810-011-1115 | 0.510 ppm |
| 2017-01-27 | 5810-147-1240 | 3.80 ppm |
| 2017-01-27 | 5810-149-1350 | 7.40 ppm |
| 2017-01-27 | 5810-234-0845 | 4.30 ppm |
| 2017-01-27 | 5810-398-1315 | 4.40 ppm |
| 2017-01-27 | 5810-678-1015 | 4.20 ppm |
| 2017-01-30 | 5810-154-0845 | 6.30 ppm |
| 2017-01-30 | 5810-182-1330 | 6.10 ppm |
| 2017-01-30 | 5810-274-1020 | 2.00 ppm |
| 2017-01-30 | 5810-364-1130 | 3.20 ppm |
| 2017-01-30 | 5810-563-1240 | 6.00 ppm |
| 2017-01-31 | 5810-313-0925 | 3.70 ppm |
| 2017-01-31 | 5810-328-0955 | 4.60 ppm |
| 2017-01-31 | 5810-642-1125 | 3.50 ppm |
| 2017-01-31 | 5810-650-1245 | 4.00 ppm |
| 2017-01-31 | 5810-693-0855 | 4.70 ppm |
| 2017-02-01 | 5810-282-0920 | 2.40 ppm |
| 2017-02-01 | 5810-290-0930 | 2.00 ppm |
| 2017-02-01 | 5810-321-1140 | 4.20 ppm |
| 2017-02-01 | 5810-324-1015 | 3.00 ppm |
| 2017-02-01 | 5810-366-1055 | 4.90 ppm |
| 2017-02-01 | 5810-385-1210 | 6.10 ppm |
| 2017-02-01 | 5810-573-1300 | 3.40 ppm |
| 2017-02-02 | 5810-262-1340 | 5.10 ppm |
| 2017-02-02 | 5810-281-1100 | 2.90 ppm |
| 2017-02-02 | 5810-326-1300 | 1.50 ppm |
| 2017-02-02 | 5810-572-0945 | 4.00 ppm |
| 2017-02-02 | 5810-624-1020 | 4.50 ppm |
| 2017-02-02 | 5810-643-1145 | 3.00 ppm |
| 2017-02-03 | 5810-250-1200 | 0.650 ppm |
| 2017-02-03 | 5810-296-1045 | 1.50 ppm |
| 2017-02-03 | 5810-315-1330 | 1.90 ppm |
| 2017-02-03 | 5810-363-0940 | 3.20 ppm |
| 2017-02-09 | 5810-199-0940 | 2.60 ppm |
| 2017-02-09 | 5810-202-0830 | 2.40 ppm |
| 2017-02-09 | 5810-210-1030 | 2.60 ppm |
| 2017-02-09 | 5810-226-1110 | 0.840 ppm |
| 2017-02-09 | 5810-278-1210 | 1.20 ppm |
| 2017-02-10 | 5810-128-1320 | 0.590 ppm |
| 2017-02-10 | 5810-232-1255 | ND |
| 2017-02-10 | 5810-271-1230 | 2.20 ppm |
| 2017-02-13 | 5810-217-0940 | 1.50 ppm |
| 2017-02-13 | 5810-228-1030 | 2.00 ppm |
| 2017-02-13 | 5810-230-1120 | 1.20 ppm |
| 2017-02-13 | 5810-237-0840 | 0.930 ppm |
| 2017-02-13 | 5810-261-1240 | 0.670 ppm |
| 2017-02-13 | 5810-345-1250 | 2.60 ppm |
| 2017-02-14 | 5810-126-1330 | 2.40 ppm |
| 2017-02-14 | 5810-185-1030 | 3.50 ppm |
| 2017-02-14 | 5810-728-1230 | 2.50 ppm |
| 2017-02-15 | 5810-047-1230 | 1.90 ppm |
| 2017-02-15 | 5810-057-1110 | 4.00 ppm |
| 2017-02-15 | 5810-215-1400 | 3.00 ppm |
| 2017-02-15 | 5810-338-1310 | 3.50 ppm |
| 2017-02-15 | 5810-356-1030 | ND |
| 2017-02-16 | 5810-179-1240 | 1.000 ppm |
| 2017-02-16 | 5810-187-1210 | 4.50 ppm |
| 2017-02-16 | 5810-206-1120 | 4.20 ppm |
| 2017-02-16 | 5810-608-1350 | 0.430 ppm |
| 2017-02-16 | 5810-626-1330 | ND |
| 2017-02-17 | 5810-044-1030 | ND |
| 2017-02-17 | 5810-046-1105 | ND |
| 2017-02-17 | 5810-176-1340 | 3.20 ppm |
| 2017-02-17 | 5810-277-0900 | ND |
| 2017-02-17 | 5810-381-1240 | 2.00 ppm |
| 2017-02-22 | 5810-031-1245 | 4.80 ppm |
| 2017-02-22 | 5810-169-1400 | 1.50 ppm |
| 2017-02-22 | 5810-629-1125 | 1.80 ppm |
| 2017-02-22 | 5810-710-1215 | 4.20 ppm |
| 2017-02-23 | 5810-014-1330 | 0.580 ppm |
| 2017-02-23 | 5810-050-1245 | 0.540 ppm |
| 2017-02-23 | 5810-204-1230 | 4.30 ppm |
| 2017-02-23 | 5810-295-0915 | 3.80 ppm |
| 2017-02-23 | 5810-324-1000 | 2.80 ppm |
| 2017-02-23 | 5810-340-1040 | 2.20 ppm |
| 2017-02-23 | 5810-342-0840 | 3.90 ppm |
| 2017-02-23 | 5810-393-1015 | 5.60 ppm |
| 2017-02-24 | 5810-171-1030 | 3.70 ppm |
| 2017-02-24 | 5810-188-0830 | 1.80 ppm |
| 2017-02-24 | 5810-266-1200 | 2.90 ppm |
| 2017-02-24 | 5810-316-1110 | 2.10 ppm |
| 2017-02-24 | 5810-329-0910 | 3.90 ppm |
| 2017-02-24 | 5810-344-1345 | 2.50 ppm |
| 2017-02-27 | 5810-212-1255 | 2.00 ppm |
| 2017-02-27 | 5810-561-1145 | 1.50 ppm |
| 2017-02-27 | 5810-616-1000 | 1.80 ppm |
| 2017-02-27 | 5810-714-0915 | 0.910 ppm |
| 2017-02-27 | 5810-716-0835 | 1.80 ppm |
| 2017-02-28 | 5810-036-1350 | 9.50 ppm |
| 2017-02-28 | 5810-191-1330 | 4.30 ppm |
| 2017-02-28 | 5810-319-1310 | 7.20 ppm |
| 2017-02-28 | 5810-337-1400 | 4.80 ppm |
| 2017-02-28 | 5810-685-1420 | 4.60 ppm |
| 2017-02-28 | 5810-712-1300 | 1.90 ppm |
| 2017-03-01 | 5810-054-1330 | 2.80 ppm |
| 2017-03-01 | 5810-063-1010 | 3.20 ppm |
| 2017-03-02 | 5810-065-1000 | 5.80 ppm |
| 2017-03-02 | 5810-201-1115 | 6.40 ppm |
| 2017-03-02 | 5810-205-1335 | 2.40 ppm |
| 2017-03-02 | 5810-598-1245 | 1.50 ppm |
| 2017-03-03 | 5810-035-1315 | 7.70 ppm |
| 2017-03-03 | 5810-275-1250 | 3.60 ppm |
| 2017-03-03 | 5810-293-1235 | 7.70 ppm |
| 2017-03-03 | 5810-312-1400 | 6.70 ppm |
| 2017-03-06 | 5810-017-0925 | 5.00 ppm |
| 2017-03-06 | 5810-019-1000 | 4.30 ppm |
| 2017-03-06 | 5810-152-1140 | 2.80 ppm |
| 2017-03-06 | 5810-160-1325 | 2.70 ppm |
| 2017-03-06 | 5810-175-0840 | 1.70 ppm |
| 2017-03-06 | 5810-208-1355 | 3.20 ppm |
| 2017-03-06 | 5810-596-1235 | 2.60 ppm |
| 2017-03-07 | 5810-073-1235 | 2.70 ppm |
| 2017-03-07 | 5810-079-1200 | 6.90 ppm |
| 2017-03-07 | 5810-081-1120 | 6.40 ppm |
| 2017-03-07 | 5810-082-1045 | 4.40 ppm |
| 2017-03-07 | 5810-089-1340 | 2.80 ppm |
| 2017-03-07 | 5810-096-0950 | 2.10 ppm |
| 2017-03-07 | 5810-100-0900 | 3.30 ppm |
| 2017-03-07 | 5810-336-0805 | 1.70 ppm |
| 2017-03-08 | 5810-072-1100 | 2.00 ppm |
| 2017-03-08 | 5810-102-1155 | 2.80 ppm |
| 2017-03-09 | 5810-238-1320 | 1.50 ppm |
| 2017-03-09 | 5810-239-1350 | 4.90 ppm |
| 2017-03-13 | 5810-165-1015 | 1.60 ppm |
| 2017-03-13 | 5810-167-0935 | 0.830 ppm |
| 2017-03-13 | 5810-178-1058 | 2.80 ppm |
| 2017-03-13 | 5810-221-0855 | 1.50 ppm |
| 2017-03-13 | 5810-341-1245 | 1.60 ppm |
| 2017-03-13 | 5810-386-1345 | 2.70 ppm |
| 2017-03-14 | 5810-272-1100 | 0.860 ppm |
| 2017-03-14 | 5810-273-0900 | 1.40 ppm |
| 2017-03-14 | 5810-334-1200 | ND |
| 2017-03-14 | 5810-335-1020 | 3.00 ppm |
| 2017-03-15 | 5810-107-0925 | 1.10 ppm |
| 2017-03-15 | 5810-108-1045 | 1.30 ppm |
| 2017-03-15 | 5810-134-1215 | 0.650 ppm |
| 2017-03-15 | 5810-224-1245 | 1.60 ppm |
| 2017-03-16 | 5810-087-1215 | 2.30 ppm |
| 2017-03-16 | 5810-088-1140 | 1.80 ppm |
| 2017-03-16 | 5810-225-1355 | 1.30 ppm |
| 2017-03-16 | 5810-270-1330 | 1.40 ppm |
| 2017-03-16 | 5810-327-1425 | ND |
| 2017-03-17 | 5810-213-1400 | 4.10 ppm |
| 2017-03-17 | 5810-231-1235 | 0.650 ppm |
| 2017-03-17 | 5810-267-1330 | ND |
| 2017-03-17 | 5810-314-1200 | 0.620 ppm |
| 2017-03-28 | 5810-223-1017 | 3.90 ppm |
| 2017-05-08 | 5810-207-1235 | 0.980 ppm |
| 2017-05-08 | 5810-211-1125 | 2.80 ppm |
| 2017-05-08 | 5810-261-1345 | 1.20 ppm |
| 2017-05-08 | 5810-380-1415 | 6.20 ppm |
| 2017-07-05 | 5810-268-1230 | 7.30 ppm |
| 2017-07-05 | 5810-269-1330 | 2.30 ppm |
| 2017-07-06 | 5810-209-1355 | 3.00 ppm |
| 2017-07-11 | 5810-056-1330 | 2.70 ppm |
| 2017-09-07 | 5810-131-1130 | 4.60 ppm |
| 2017-09-13 | 5810-198-1248 | 6.50 ppm |
| 2017-09-15 | 5810-394-1105 | 3.00 ppm |
| 2017-09-18 | 5810-120-0900 | ND |
| 2017-09-18 | 5810-170-1105 | 3.20 ppm |
| 2017-09-18 | 5810-220-1245 | 5.40 ppm |
| 2017-09-19 | 5810-010-1140 | 5.20 ppm |
| 2017-09-19 | 5810-095-1245 | 2.40 ppm |
| 2017-09-19 | 5810-099-1345 | 2.20 ppm |
| 2017-09-19 | 5810-103-1320 | 1.70 ppm |
| 2017-09-19 | 5810-276-0945 | 3.10 ppm |
| 2017-09-19 | 5810-348-1040 | 2.30 ppm |
| 2017-09-19 | 5810-349-1050 | 16.0 ppm |
| 2017-09-19 | 5810-359-1000 | 4.60 ppm |
| 2017-09-20 | 5810-339-1000 | 5.00 ppm |
| 2017-09-20 | 5810-699-0900 | 2.50 ppm |
| 2017-09-20 | 5810-704-1130 | 3.10 ppm |
| 2017-10-09 | 5810-173-1120 | 7.60 ppm |
| 2017-11-07 | 5810-312-1000 | 6.60 ppm |
| 2017-11-07 | 5810-607-1300 | 0.450 ppm |
| 2017-11-07 | 5810-720-1100 | ND |
| 2017-11-15 | 5810-116-1320 | 2.60 ppm |
| 2017-12-11 | 5810-214-1100 | ND |
| 2017-12-13 | 5810-168-1135 | 3.00 ppm |
| 2017-12-19 | 5810-305-1005 | 8.20 ppm |
| 2018-01-12 | 5810-748-1400 | 5.30 ppm |
| 2018-01-30 | 5810-053-1000 | 0.710 ppm |
| 2018-02-09 | 5810-325-1100 | 4.30 ppm |
| 2018-09-20 | 5810-752-1011 | 1.50 ppm |
| 2019-05-17 | 5810-750-1345 | 1.30 ppm |
| 2019-07-05 | 5810-754-0930 | 2.00 ppm |
| 2019-07-26 | 5810-643-1000 | 2.20 ppm |
| 2019-09-05 | 5810-131-0925 | 4.50 ppm |