Pesticides and Water Quality - Texas Center for Policy Studies

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Table 13. Samples in Drinking Water Systems Exceeding MCLs for Pesticides, January 1993 - March 1998System Name Date of Sample Chemical Name PPBAquilla Water Supply 2/3/98 Atrazine 5.4District5/15/97 Atrazine 10.55/15/97 Alachlor 5.84/30/97 Atrazine 8.9Sagemeadow MunicipalUtility4/30/97 Alachlor 5.56/16/97 Atrazine 8.86/16/97 Atrazine 8.8City of Dawson 4/15/97 Atrazine 3.9Friona Municipal Water 4/16/97 Atrazine 3.3SupplyCity of Robinson 4/24/96 Atrazine 3.7City of Marlin 4/4/95 Atrazine 9.65/15/95 Atrazine 3.6City of Ft. Worth 5/5/97 Atrazine 3.1City of Midlothian 4/15/97 Atrazine 3.2Combined Water SupplyCorporation5/27/97 Atrazine 3.74/15/97 Atrazine 4.0Notes: MCL for Alachlor is 4.0 ppb; MCL for Atrazine is 3.0 ppb (parts per billion). One of the samples thatexceeded the MCL for atrazine was obtained by Sagemeadow Municipal Utility from the City of Houston, while theother was obtained from a well in the Gulf Coast Aquifer; Friona obtains its water from groundwater.Source: Information from Organic Sampling Database, Water Utilities Section, Water Quality Division, TexasNatural Resource Conservation Commission.Table 14. Water Bodies on the State of Texas 1998 303(d) Threatened Waters List Because of Elevated Levelsof Atrazine and/or Alachlor in Drinking WaterSegment NumberSegment Name0303-A Big Creek Lake0507 Lake Tawakoni0815 Bardwell Reservoir0816 Lake Waxahachie0821 Lake Lavon0836 Richland-Chambers Reservoir0838 Joe Pool Lake1242-A Marlin City Lake System1254 Aquilla LakeSource: Texas Natural Resource Conservation Commission, Draft State of Texas 1998 303(d) List, March 13, 1998.19
E. Summary of Statewide DataThe failure to meet surface water quality standards for aquatic life or fish consumption due to elevatedpesticide levels, concerns about pesticides in fish tissue or sediment and the threat to drinking water frompesticides has led to a number of water bodies being proposed for inclusion on the 303(d) List in 1998. Inall, there are 21 water bodies listed in part because of contamination caused by pesticides (Table 15).Despite this well-documented statewide list of water bodies affected by pesticides, there is still a greatlack of monitoring data. Because the TNRCC Surface Water Quality Monitoring Program and DrinkingWater Program only monitor for 13 of the same pesticides, the links between pesticides in drinking waterand in surface water bodies can not be readily established, making prevention more difficult. In addition,the under-funded fish tissue sampling program of the Texas Department of Health has resulted inscattered monitoring for pesticides in only 54 water bodies throughout the state, most of which occurredbetween 1980 and 1984. 41Table 15. Water Bodies on the State of Texas 1998 303(d) Lists due to the Presence of Pesticides in FishTissue, Surface Water or Drinking WaterSegment Number Water Body Chemical of Concern Affected or ThreatenedUse0303-A Big Creek Lake Atrazine Drinking Water0507 Lake Tawakoni Atrazine Drinking Water0815 Bardwell Reservoir Atrazine Drinking Water0816 Lake Waxahachie Atrazine Drinking Water0821 Lake Lavon Atrazine Drinking Water0836 Richland-Chambers AtrazineDrinking WaterReservoir0838 Joe Pool Lake Atrazine Drinking Water1242-A Marlin City Lake AtrazineDrinking WaterSystem1254 Aquilla Lake Atrazine, Alachlor Drinking Water0805 Upper Trinity River Chlordane Fish Consumption Ban0806West Fork Trinity RiverChlordaneFish Consumption Ban0806-A0829Fosdic LakeClear Fork, TrinityRiverChlordane, , Dieldrin,DDEChlordaneFish Consumption Ban0829-ALake ComoChlordane, Dieldrin,DDE0841 Lower West Fork, ChlordaneTrinity River1101 Clear Creek, tidal Chlordane, CarbonDisulfideFish Consumption BanFish ConsumptionAdvisory41 Seafood Safety Division, Texas Department of Health, Fish Tissue Sampling Data, 1970 - 1997 (Austin: TDH, 1998).20
Page 1 and 2: I. INTRODUCTION AND SUMMARYA. Effec
Page 3 and 4: courses, parks, highway right-of-wa
Page 5: 1992, 1994 and 1996 Clean Rivers Pr
Page 8 and 9: The TNRCC has also issued “statew
Page 10 and 11: elated monitoring waivers under the
Page 12 and 13: II. PESTICIDES IN SURFACE WATERThis
Page 15 and 16: whether Texas water bodies are expe
Page 17 and 18: screening levels) for fish tissue a
Page 19 and 20: detected pesticides have been banne
Page 21 and 22: section of a segment was considered
Page 23 and 24: which examines the liver and reprod
Page 25 and 26: Water Body Year of Sample Pesticide
Page 27 and 28: Water Body Year of Sample Pesticide
Page 29: een detected in Texas public drinki
Page 33 and 34: The Clean Rivers Program also has a
Page 35 and 36: Brazos/Colorado Coastal BasinDuring
Page 37 and 38: mosquito control program conducted
Page 39 and 40: San Antonio River BasinThe 1994 Ass
Page 41 and 42: • Cibolo Creek Municipal Authorit
Page 43 and 44: Compound No. of Sites Detections No
Page 45 and 46: urban land use areas were the main
Page 47 and 48: These rural landowners are reported
Page 49 and 50: water include the Tulia and Friona
Page 51 and 52: IV. ENHANCING WATER QUALITY PROTECT
Page 53 and 54: 3. A determination of the public wa
Page 55 and 56: use, the source water assessments c
Page 57 and 58: V. CONCLUSION:TEXAS NEEDS A PESTICI
Page 59 and 60: DRINKING WATER MONITORING WAIVERS F
Page 61 and 62: At the time this report was being p
Page 63 and 64: Proposed CMR 162 Alternative Monito
Page 65 and 66: The need for reasonably location-sp
Page 67 and 68: Table B-3. Pesticide Analysis Costs
Page 69 and 70: application and treatment rates, al

Pesticides and Water Quality - Texas Center for Policy Studies

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