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Boston Harbor and Massachusetts Bay
MWRA Environmental Quality Department


The Neponset River


NEPONSET RIVER WATER QUALITY

The Neponset River often fails to meet state bacterial water quality standards, except at the river mouth, where river water mixes with cleaner harbor water. Water quality does not consistently meet standards near Tenean Beach or MWRA's Commercial Point combined sewer overflow treatment facility outfall in Dorchester Bay.

Water quality problems in the Neponset watershed include bacterial contamination, eutrophication, and toxic chemicals in sediments. The lower Neponset receives contaminants from leaking septic systems and stormwater runoff.

Download Neponset River data below


Neponset River  sampling map
See larger map with sampling locations

See all Harbor & river sampling locations


Water Quality Parameter

Historic Range for the Neponset*

Data

Dissolved Oxygen

3.79 -  11.97 mg/L   Mean: 7.82

Download physical data

(1554 readings)

Temperature

44.9 -  81.1 deg F   Mean: 64.4
(1552 readings)

Salinity

0.12 -  32.71 PSU   Mean: 27.36
(1507 readings)

pH

6.68 -  8.09   Mean: 7.76
(1463 readings)

secchi disk2.jpg

Secchi Disk Depth

0.3 -  2.7 m   Mean: 1.29

Download clarity data

(683 readings)
TSS 0.57 -  69.6 mg/L   Mean: 10.37
(190 readings)

algae-bloom-charles.jpg

Nutrient Chemistry

PO4: 0.05 -  1.5 umol/L   Mean: 0.66

Download nutrients data

(165 readings)

Chlorophyll & Phaeophytin

Chl a: 0.74 -  41.7 umol/l   Mean: 5.55
(164 readings)

Fecal_Coliform_Plate.jpg

Enterococcus

0 -  27800 count/100 mL  Geo. mean: 5

Download bacteria data

(961 readings)

E. coli

52 -  3130 count/100 mL  Geo. mean: 178
(61 readings)

Fecal coliform

0 -  2340000 count/100 mL  Geo. mean: 22
(982 readings)


Boston Harbor's Tributary Rivers