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2017 Nitrate Monitoring Technical Memo
2019 Nitrate Monitoring Technical Memo (PDF)
Centralia Area Hydrogeologic Framework Report Oct-2023 (PDF)
2025 Centralia Groundwater Nitrate Investigation Report Phase 1 and Phase 2 (PDF)
Nitrate Frequently Asked Questions (PDF)
Nitrate Timeline (PDF)
Centralia Nitrate Aquifer Flow Direction Map (PDF)
Centralia Nitrate Plume Map (PDF)