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PROVISIONAL--Information included in this presentation is preliminary and subject to revision. Preliminary Findings* of the 12-State MTBE/VOC Drinking Water Retrospective. A cooperative study by the USGS and the USEPA. Stephen Grady U.S. Geological Survey East Hartford, Conn.

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preliminary findings of the 12 state mtbe voc drinking water retrospective

PROVISIONAL--Information included in this presentation is preliminary and subject to revision

Preliminary Findings* of the 12-State MTBE/VOC Drinking Water Retrospective

A cooperative study by the USGS

and the USEPA

Stephen Grady

U.S. Geological Survey

East Hartford, Conn.

(860) 291-6758

sgrady@usgs.gov

Michael Osinski

U.S. Environmental Protection Agency

Washington, D.C.

(202) 260-6252

OSINSKI.MICHAEL@epamail.epa.gov

* additional analysis of data will be conducted through mid-1999 with a final interpretive report plannedfor release in December 1999

design
Design
  • 12 Northeast and Mid-Atlantic States
  • Only community water systems (CWSs)
  • Representative sample of 20% of all CWSs
  • Stratified-random selection by source of water, size of system, and State
  • Water-quality data for 1993-98 obtained from State Agencies

PROVISIONAL--Information included in this presentation is preliminary and subject to revision

major points for 10 states
Major Points--for 10-States*
  • MTBE detected in drinking water from: 7% of CWSs at concentrations > 1 mg/L 2% of CWSs at concentrations > 5 mg/L 1% of CWSs at concentrations > 20 mg/L
  • MTBE projected to affect: ~600 CWSs at concentrations > 1 mg/L ~180 CWSs at concentrations > 5 mg/L ~ 80 CWSs at concentrations > 20 mg/L

* no MTBE data for drinking water in DE and PA

PROVISIONAL--Information included in this presentation is preliminary and subject to revision

major points continued
Major Points--continued
  • MTBE detected in 15% of CWSs in RFG/OXY* areas and 3% outside
  • BTEX detected in ~5% of CWSs, but not with MTBE
  • VOCs co-occur in ~half of samples with MTBE; mostly solvents & THMs

* where oxygenate used is MTBE

PROVISIONAL--Information included in this presentation is preliminary and subject to revision

slide7

MTBE detected* 5 times more often in drinking water from CWSs in RFG/OXY areas

Percent of CWSs

* at concentrations > 1 mg/L

PROVISIONAL--Information included in this presentation is preliminary and subject to revision