Salt in Dutchess Co. Waters Stuart Findlay Vicky Kelly Where are we now? Compared to what? Where are we headed? Should we be worried?

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Salt in Dutchess Co. Waters Stuart Findlay Vicky Kelly Where are we now? Compared to what? Where are we headed? Should we be worried?

Acknowledgements Fishkill Creek Watershed Comm. (R. Oestrike) Environmental Management Council (D. Burns, C. Klocker) Hudson River NERR (W.C. Nieder, S. Ciparis) Town of Clinton CAC (N. Coller) Vassar College (K. Menking et al.) Syracuse U. (D. Siegel, L. Jin) WRI – Cornell; COE - Syracuse

Some Chloride Reference Points Background - ~ 10 mg/L or less [Catskill Reservoirs] Sublethal – mg/L Subtle yet Significant –Biotic Indices –Microbial processes –Associations EPA Chronic – 230 mg/L Drinking Water Std – 250 mg/L EPA Acute – 860 mg/L Lethal or higher

SIMPLER REFERENCE <10 mg/L ENVIRONMENTAL EFFECTS ~ 100 mg/L LETHAL > 1000 mg/L DUTCHESS COUNTY WATERS 80 mg/L (+/- 79 SD)

Mullaney et al., USGS DC

Ten Mile Crum Elbow Casperkill Chloride (mg/L) Wappinger Fishkill

Downstream Increases FISHKILL CREEK Summer 2005 Population

Residential Land Cover and Chloride (M. Essery) Subwatersheds in the Fishklill Basin

High concentrations in summer East Branch Wappinger Creek, Millbrook No decline in summer concentrations

Long-term increases in concentration East Branch of the Wappinger Creek Kelly et al. ES&T 2008

Saw Kill Creek HRNERR Low-density residential Yearly mean Cl - concentrations have doubled since 1991 (20 to 40 mg/L) Similar Cl - concentrations throughout year

All Patterns Suggest a Reservoir Soil Sorption or Groundwater? STREAM Road salt biggest source – others?

SOIL CORES HOLD Cl LONGER THAN WATER Kincaid and Findlay, 2009

Groundwater ? Fig. 4: Frequency distribution of chloride concentrations in surface and well samples from Dutchess County. A few wells have Cl > surface water concentration – Could support high baseflow concentrations Private drinking-water wells Non-random but widely distributed

CHLORIDE IS NOT ALONE D. Burns - EMC

Should we be Worried? At the brink, trends are not encouraging Groundwater concentrations must be increasing What else is coming along?

Scope for Action Reduced Salt is in Everyone’s Interest Widespread Problem, Lots of Mental Horsepower Solutions may Require Capital

What do we Need to Know? Today’s Program Environmental Effects – Not Huge Yet but Close? Human Health Effects Cost –Direct (Salt is cheap, labor is not, use is high) –Indirect (Corrosion, contamination Solution?