LandWatch State of Monterey County Report 1998 3.6 Water Quality Ground water use in the Salinas Valley is adversely affected by nitrate contamination (Table 8). Of 240 wells listed in a 1995 report from the Monterey County Water Resources Agency, 1993 data indicated that 59 wells (25%) had nitrate concentrations exceeding the drinking water standard of 45 mg/l as NO3.(9) Table 8--Nitrate Concentrations in Salinas Valley Wells Location # of Wells Average NO3 Value&endash;1993 (mg/l) Average Change 1987-1993 (mg/l) Percent Change 1987-1993 400-Foot Aquifer 70 10.8 5.2 93% 180-Foot Aquifer 68 19.5 -1.3 -6% Forebay 39 42.5 -3.1 -7% Upper Valley 24 67.2 2.6 4% East Side 39 85.1 -0.2 0% All locations 240 36.1 0.9 3% Locations Outside 400-foot Aquifer 170 53.6 -2.0 -4% 1998 Table of Contents: 1.0 Executive Summary 1.1 Findings 1.2 Recommendations 1.3 Areas of Future Study 2.0 Summary of Indicators 3.0 State of Monterey County 1998 3.1 Introduction 3.2 Population and Population Forecasts 3.3 Development&emdash;Approved and Pending Projects 3.4 Roads and Highways 3.5 Water Supply 3.6 Water Quality 3.7 Wastewater Treatment 3.8 Air Quality 3.9 Agricultural Land 3.10 Nonagricultural Land&emdash;Open Space 3.11 Affordable Housing 3.12 Schools 3.13 Economy 3.14 Rare, Threatened, and Endangered Species 3.15 General Plans 4.0 References
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