Warrenton Water System

SOURCE WATER ASSESSMENT SUMMARY BROCHURE WHAT ARE THE POTENTIAL SOURCES OF CONTAMINATION TO WARRENTON WATER SYSTEM’S PUBLIC DRINKING WATER SUPPLY? WARRENTON WATER SYSTEM The primary intent of this inventory was to PWS # 4100932 identify and locate significant potential sources of contaminants of concern. The delineated WHAT IS A SOURCE WATER ASSESSMENT? drinking water protection area is primarily The Source Water Assessment was recently dominated by forestry land uses. The potential completed by the Department of Environmental contaminant sources identified in the watershed Quality (DEQ) and the Oregon Department of include clear cuts, gravel pits, landslides/debris Human Services (DHS) to identify the surface flow, and Saddle Mountain State Park. This areas (and/or subsurface areas) that supply water provides a quick look at the existing potential to Warrenton Water System’s public water sources of contamination that could, if system intake and to inventory the potential improperly managed or released, impact the contaminant sources that may impact the water water quality in the watershed. supply. WHAT ARE THE RISKS FOR OUR SYSTEM? WHY WAS IT COMPLETED? A total of four potential contaminant sources The Source Water Assessment was completed to were identified in Warrenton Water System’s provide information so that Warrenton Water drinking water protection area. Some of the System’s public water system staff/operator, potential sources, such as the clear cuts, are consumers, and community citizens can begin area-wide and occur throughout the drinking developing strategies to protect the source of water protection area. All four of these are their drinking water, and to minimize future located in the sensitive areas and three are high- public expenditures for drinking water to moderate-risk sources within “sensitive treatment. The assessment was prepared under areas”. The sensitive areas within the Warrenton the requirements and guidelines of the Federal Water System drinking water protection area Safe Drinking Water Act (SDWA). include areas with high soil permeability, high soil erosion potential, high runoff potential and WHAT AREAS ARE INCLUDED IN WARRENTON areas within 1000’ from the river/streams. The WATER SYSTEM’S DRINKING WATER sensitive areas are those where the potential PROTECTION AREA? contamination sources, if present, have a greater The drinking water for Warrenton is supplied by potential to impact the water supply. The intakes on Camp Creek, Little South Fork, Big information in this assessment provides a basis South Fork Lewis and Clark River, and Lewis for prioritizing areas in and around our and Clark Rivers. This public water system community that are most vulnerable to potential serves approximately 9,080 citizens. The impacts and can be used by the Warrenton intakes are located in the Youngs River Water System community to develop a Watershed in the Lower Columbia Sub-Basin of voluntary Drinking Water Protection Plan. the Lower Columbia Basin. The streams that contribute to the intakes extend upstream a NEED MORE INFORMATION? cumulative total of approximately 24.8 miles Warrenton Water System’s Source Water and encompass a total area of approximately Assessment Report provides additional details 28.7 square miles. The combination of the on the methodology and results of this geographic areas contributing to the four intakes assessment. The full report is available for make-up Warrenton’s drinking water protection review at: area. Included in this area are a number of unnamed tributaries to the main stem. The ______boundaries of the Drinking Water Protection Contact Warrenton Water System staff if you Area are illustrated on the figure attached to this would like additional information on these summary. Source Water Assessment results.

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES

PWS# 4100932 WARRENTON WATER SYSTEM

Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Name Location City Listing Areas (1) Potential Impacts Comments Type 1 Managed Forest Clearcuts Throughout DWPA Warrenton Field- Within Higher Cutting and yarding of trees may Land - Clearcut Observation sensitive contribute to increased erosion, resulting in Harvest (< 35 yrs.) turbidity and chemical changes in drinking The majority of clearcuts were observed in the Lewis and Clark water supply. Over-application or improper and Big South Fork drainages. handling of pesticides or fertilizers may impact drinking water source. Managed Forest Higher Cutting and yarding of trees may Land - Clearcut contribute to increased erosion, resulting in Harvest (< 35 yrs.) turbidity and chemical changes in drinking The majority of clearcuts were observed in the Lewis and Clark water supply. Over-application or improper and Big South Fork drainages. handling of pesticides or fertilizers may impact drinking water source. Managed Forest Higher Cutting and yarding of trees may Land - Clearcut contribute to increased erosion, resulting in Harvest (< 35 yrs.) turbidity and chemical changes in drinking The majority of clearcuts were observed in the Lewis and Clark water supply. Over-application or improper and Big South Fork drainages. handling of pesticides or fertilizers may impact drinking water source. Managed Forest Higher Cutting and yarding of trees may Land - Clearcut contribute to increased erosion, resulting in Harvest (< 35 yrs.) turbidity and chemical changes in drinking water supply. Over-application or improper handling of pesticides or fertilizers may impact drinking water source.

2 Mines/Gravel Pits Gravel Pits Throughout DWPA Warrenton Field- Within Higher Spills, leaks, or improper handling of Observation sensitive chemicals and wastes generated in mining operations or from heavy equipment may impact the drinking water supply. Mines/Gravel Pits Gravel Pit Southeast of intake on Higher Spills, leaks, or improper handling of chemicals and wastes generated in mining operations or from heavy equipment may No visual observation of site - site location is based on impact the drinking water supply. topographic map.

Note: Sites and areas identified in this Table are only potential sources of contamination to the drinking water. Environmental contamination is not likely to occur when contaminants are used and managed properly. (1) Where multiple potential contaminant sources exist at a site, the highest level of risk is used. (2) See Table 3 for database listings (if necessary). 3/10/2003 Page 1 of 2 TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES

PWS# 4100932 WARRENTON WATER SYSTEM

Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Name Location City Listing Areas (1) Potential Impacts Comments Type 3 Campgrounds/RV Saddle Mountain Saddle Mountain Road Warrenton Field- Within Moderate Leaks or spills of automotive fluids or Parks State Park Observation sensitive improperly managed septic systems and wastewater disposal may impact drinking water supply. Heavy usage along edge of waterbody may contribute to erosion, causing turbidity. Large Capacity Moderate If not properly sited, designed, installed, Septic Systems and maintained, septic systems can (serves > 20 impact drinking water. people) - Class V UICs Injection/Dry Wells, Moderate Shallow injection wells may transport Sumps - Class V untreated wastewater (process or storm UICs water) directly into groundwater and impact drinking water.

4 Other Landslides/Debris East of intake Warrenton Field- Within Lower The impacts of this potential contaminant Landslides/Debris Flow Observation sensitive source will be addressed during the Flow enhanced inventory. Location approximate. According to Youngs Bay Watershed Assessment, small areas within the Little South Fork, Big South Fork, & Lewis & Clark are in a "high debris flow hazard zone" according to DOGAMI. PWS contact indicates not historically an issue.