Part of a new industry series Sustaining the Future™: Climate Risk Intelligence™ for Water Infrastructure
Climate Hazards Facing Water Systems
Drought, extreme heat, intense precipitation, flooding, wildfire, and sea-level rise are reshaping the water risk landscape across the United States. Persistent drought and declining mountain snowpack are reducing natural water storage and threatening supply reliability in regions dependent on meltwater. Snowpack in the western United States has dropped by about twenty percent over the past half-century, lowering spring runoff and reservoir inflows relied on for drinking water, irrigation, and hydropower (USGS, 2023). Groundwater depletion is worsening as major aquifers drop by one to three feet per year due to chronic over-extraction (USGS, 2023).
Increasing Storm Intensity and Heavier Precipitation
Heavy precipitation and storm intensity have also increased. Since 1958, the Northeast has seen a 70% increase in heavy rainfall, while the Midwest has seen a 45% increase (NOAA, 2023). Storms once considered one-in-one-hundred-year events now occur every twenty-five years in many regions. These extremes overwhelm stormwater systems, trigger inflow and infiltration in wastewater networks, damage pump stations, and flood treatment facilities.
Escalating Sea-Level Rise and Coastal Vulnerabilities
Sea-level rise adds another layer of risk. Projections of 1 to 3 feet of sea-level rise by 2100 threaten more than 100 coastal wastewater treatment plants (EPA, 2023; IPCC, 2021). Saltwater intrusion affects about 15% of coastal wells and continues to increase each decade (USGS, 2022). Higher tides and more frequent storm surge events elevate erosion, inundate infrastructure, and damage coastal pipes and outfalls.
Escalating Sea-Level Rise and Coastal Vulnerabilities
Rising temperatures further compound operational challenges. Heatwaves—now lasting three times longer than in the 1960s (NOAA, 2023)—increase energy consumption at treatment plants by two to four percent per degree of warming (DOE, 2022). Warmer conditions reduce dissolved oxygen levels, intensify algal bloom risk, and increase stress on treatment processes.
Wildfire Impacts on Watersheds and Water Quality
Wildfires magnify watershed vulnerability. Post-fire sediment loads can increase by 100-fold, introducing debris and contaminants into surface water supplies and raising treatment costs by $1–3 million per event (USFS, 2022; AWWA, 2022).
The Growing Challenge of Compound Climate Hazards
More than 60% of major disruptions now stem from compound hazards—events in which heat, drought, wildfire, and flooding interact (IPCC, 2021). These interconnected risks challenge traditional engineering assumptions and underscore the need for climate-informed planning.
More in the next post on Sustaining the Future™: Climate Risk Intelligence™ for Water Infrastructure…
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