Online Data Sources

Mystic Monitoring Network Data

Baseline Data:

Below are data collected by MyRWA’s baseline monitoring program. Volunteers collect water samples every month at ten sites throughout the watershed (see table below for sampling locations). Data are compiled in Excel spreadsheets and summarized by year. Only data that has passed quality assurance requirements appears here. Each file contains multiple worksheets, one for each parameter: fecal coliform or E. coli., total suspended solids, nitrate + nitrite, total phosphorus, conductivity, and dissolved oxygen, pH, water temperature, water color, and water odor. Please contact marybeth@mysticriver.org with any questions or comments.

Site ID Description
ABR049
Aberjona River at Salem St., Woburn, MA
ABR028
Aberjona River at Washington St., Winchester, MA
ABR006
Aberjona River at USGS, on Mystic Valley Parkway across from Mystic Ave., Winchester, MA.
UPL001
Upper Mystic Lake, at the Mystic Lakes Dam (by Medford Boat Club off of Mystic Valley Parkway), Medford, MA.
MYR071
Mystic River at High St., outlet from Lower Mystic Lake, Medford, MA.
MIB001
Mill Brook at Mt. Pleasant Cemetery, upstream of weir, Arlington, MA.
WIB001
Winn’s Brook at Little Pond, on Brighton St., Belmont, MA.
ALB006
Alewife Brook at Broadway, Somerville, MA.
MEB001
Meetinghouse Brook, outlet into Mystic River just downstream of Winthrop St. bridge, Medford, MA.
MAR036
Malden River at Medford St., Malden, MA.

Hot Spot Data:

Below are links, by year, to data collected by MyRWA's Hot Spot monitoring program.

  • 2001
  • 2002
  • 2003
  • 2004
  • 2005
  • 2006
  • 2007

    Massachusetts Class B Surface Water Quality Standards (314 CMR 4.05).
    Please use this as a reference to the MMN water quality data.

    Parameter Criteria
    Dissolved Oxygen
    Shall not be less than 5.0 mg/l unless background conditions are lower, levels shall not be lowered below 60% saturation due to discharge
    Temperature
    Shall not exceed 28.30C and the rise due to discharge shall not exceed 2.80C
    pH
    Shall be in the range of 6.5 through 8.3 standard units and not more than 0.5 standard units outside the background range.
    Fecal Coliform Bacteria
    Shall not exceed a geometric mean of 200 organisms per 100 ml, nor shall 10% of the samples exceed 400 per 100 ml. Please note that as of January 1 2007, these standards have been replaced by the standards for E. coli and Enteroccocus listed below.
    E. coli
    Shall not exceed a geometric mean of 126 organisms per 100 ml.
    Enteroccocus
    Shall not exceed a geometric mean of 33 organisms per 100 ml.
    Solids
    These waters shall be free from floating, suspended and settlable solids in concentrations and combinations that would impair any use assigned with this Class, that would cause aesthetically objectionable conditions, or that would impair the benthic biota or degrade the chemical composition of the bottom.
    Color and Turbidity
    These waters shall be free from color and turbidity in concentrations or combinations that are aesthetically objectionable or would impair any use assigned to this class.
    Oil and Grease
    These waters shall be free from oil, grease, and petrochemicals that produce a visible film on the surface of the water, impart an oily taste to the water or an oily or other undesirable taste to the other portions of aquatic life, coat the banks or bottom of the water course, or are deleterious or become toxic to aquatic life.
    Taste and Odor
    None in such concentrations or combinations that are aesthetically objectionable, that would impair any use assigned to this Class, or that would cause tainting or undesirable flavors in the edible portions of aquatic life.

    Federal

    Other

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