2012

Dry Season

2013

Wet Season

2017

Dry Season

2018

Wet Season

2022

Dry Season

2023

Wet Season

Sample Location

Distance km (miles)

NO₃-N (mg/l)

NO₃-N (mg/l)

NO₃-N (mg/l)

NO₃-N (mg/l)

NO₃-N (mg/l)

NO₃-N (mg/l)

Upstream

0

ND

ND

ND

ND

4.36

2.56

Tillman WWTP

5.07 (3.2)

ND

ND

ND

ND

4.54

3.55

Sepulveda Basin

6.25 (3.9)

3.8

3.86

4.04

4.2

6.17

3.3

Glendale Narrows

35.77 (22.2)

4.86

1.63

4.2

2.78

4.34

3.2

Arroyo Seco Confluence

44.52 (27.7)

4.16

2.53

3.68

1.3

4.77

2.75

Average

4.27

2.67

3.98

2.76

4.84

3.07

STDEV

0.54

1.12

0.27

1.45

0.77

0.41

MIN

3.8

1.63

3.68

1.3

4.34

2.56

MEDIAN

4.16

2.53

4.04

2.78

4.54

3.2

MAX

4.86

3.86

4.2

4.2

6.17

3.55