Cited by 237Fire effects on ecosystemsWater Quality and Resources StudiesSoil and Water Nutrient Dynamics

Wildfires Alter Forest Watersheds and Threaten Drinking Water Quality

Hohner, Amanda K., Rhoades, Charles C., Wilkerson, Paul, Rosario-Ortiz, Fernando L.·2019·Accounts of Chemical Research

Abstract

Wildfires are a natural part of most forest ecosystems, but due to changing climatic and environmental conditions, they have become larger, more severe, and potentially more damaging. Forested watersheds vulnerable to wildfire serve as drinking water supplies for many urban and rural communities. The highly variable nature of wildfire behavior combined with spatially complex patterns in vegetation, landscape, and hydrologic factors create uncertainty surrounding the postfire effects on water supplies. Wildfires often cause dramatic changes in forest vegetation structure and soil conditions, and alter the watershed processes that control streamflow, soil erosion, nutrient export, and downstream water chemistry. The authors' work centers on field and laboratory studies to advance knowledge of postfire changes in soil and water chemical composition that influence drinking water treatment. High intensity postfire rainstorms typically increase runoff that erodes ash and soil from burned landscapes and dramatically elevates turbidity, nutrient, and dissolved organic carbon (DOC) levels in surface waters, which can cause short-term challenges for water providers. There is also growing evidence that water quality impacts can persist after high severity fires due to slow vegetative recovery, and nitrogen and DOC have remained elevated for 15 years following high severity fire. Low-moderate temperatures during wildfire may also influence water quality. Research by the authors showed that the solubility of organic matter, and C and N released from soils increased following soil heating at temperatures ≤ 350 °C. Further, the water extracted organic matter from soils heated at 225-350 °C included higher proportions of condensed aromatic structures, such as black carbon and black nitrogen. Short-term postfire water quality degradation following high intensity rainstorms can force water treatment plants to shut down or can significantly challenge treatment process performance. Extreme turbidity and high DOC in poststorm water, coupled with compositional organic matter changes, reduced the coagulation efficiency of postfire water supplies. Field and lab-based studies documented the formation of small, aromatic soluble compounds during wildfire that contribute to inefficient DOC removal from postfire stormwater. Due to increased postfire DOC concentrations, and poor treatability of poststorm runoff, toxic disinfection byproduct (DBP) formation increased during water treatment. Exceedance of drinking water standards for the carbonaceous DBPs, trihalomethanes and haloacetic acids, may present a critical management concern for water providers following wildfires. Further, postfire formation of nitrogen compounds and increased nitrogenous DBP precursors for haloacetonitriles and chloropicrin were discovered. N-DBPs pose a public health concern due to their toxicity, and water providers should be aware of potential increases in N-DBP formation following fire. Evidence from the authors' studies demonstrates that even partially burned watersheds and wildfires burning at moderate temperature can have significant, lasting effects on C and N exports, source water quality, drinking water treatability, and DBP formation. Both short- and long-term postfire water quality impacts can create challenges for drinking water providers as they confront variability in supply and treatability. Communities, forest managers, and potable water providers will need to adapt to more frequent, destructive wildfires and anticipate greater variability in water quality.

Integrity signals

Registry

Crossref · 10.1021/acs.accounts.8b00670

Cites

71 of 71 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • The authors found formation potential of trihalomethane (THM) and haloacetic acids (HAA) at concentrations above drinking water regulatory levels due to a supply of low molecular weight DOC compounds from runoff in a burned watershed in Colorado.

    “The authors found formation potential of trihalomethane (THM) and haloacetic acids (HAA), two classes of DBPs, at concentrations above drinking water regulatory levels due to a supply of low molecular weight DOC compounds from runoff in a burned watershed in Colorado (Hohner et al., 2019).”
  • A recent study on DBPs and wildfire described the formation potential risk as being greatest below fires of medium intensity, since at high temperatures more carbon and nitrogen are volatized and, at lower temperatures, insufficient transformations take place to generate dissolved carbon and nitrogen compounds.

    “A recent study on DBPs and wildfire described the formation potential risk as being greatest below fires of medium intensity, since at high temperatures more carbon and nitrogen are volatized and, at lower temperatures, insufficient transformations take place to generate dissolved carbon and nitrogen compounds (Hohner et al., 2019).”
  • The study also observed the formation potential of unregulated haloacetonitriles (HANs) from low molecular weight DON molecules.

    “The study also observed the formation potential of unregulated haloacetonitriles (HANs), another type of DBP, from low molecular weight DON molecules (Hohner et al., 2019).”
  • Post-fire increases in nutrients can lead to increased algal growth in water supply reservoirs, with the potential to impact human health by increasing algal DOC and DBP formation risk.

    “Post-fire increases in nutrients can lead to increased algal growth in water supply reservoirs, with the potential to impact human health by increasing algal DOC and DBP formation risk (Hohner et al., 2019).”
  • In Australia and the Western US, heavy rainfall eventually stopped fire spread but triggered extensive runoff, erosion, and mass movements degrading source water quality and availability, potentially for decades.

    “In both countries, heavy rainfall eventually stopped fire spread, but triggered extensive runoff, erosion, and mass movements degrading source water quality and availability, potentially for decades to come (Hanscombe, 2020; Hohner et al., 2019; Niemeyer et al., 2020; Robinne, 2020).”

    From Scientists' warning on extreme wildfire risks to water supply (2021) · cites this paper as Hohner et al., 2019

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Hohner, A. K., Rhoades, C. C., Wilkerson, P., & Rosario-Ortiz, F. L.
Affiliations
  • Washington State University (US)
  • US Forest Service (US)
  • University of Colorado Boulder (US)
  • Department of Civil, Environmental, and Architectural Engineering, University of Colorado, Boulder, Colorado 80309, United States
Corresponding author
Hohner, Amanda K.
Venue
Accounts of Chemical Research
Published
2019-05-06
Volume
52
Issue
5
Pages
1234-1244
ISSN
  • 0001-4842 (ISSN-L)
  • 1520-4898
OpenAlex
W2944501797
Cited by
237
References
71
Citations by year
2026: 40 · 2025: 52 · 2024: 38 · 2023: 43 · 2022: 24 · 2021: 21 · 2020: 13 · 2019: 5
FWCI
8.10
Type
journal article
Language
en
Open access
closed
Locations
  • Accounts of Chemical Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Water Research Foundation (4524, 4590)
  • Environmental Protection Agency (R835865)
  • U.S. Forest Service
  • Colorado Department of Public Health and Environment
  • Division of Chemical, Bioengineering, Environmental, and Transport Systems (1512705)
  • Joint Fire Science Plan (14-1- 462 06-11)
Topics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Fire effects on ecosystems
  • Physical Sciences › Environmental Science › Water Science and Technology › Water Quality and Resources Studies
  • Physical Sciences › Environmental Science › Environmental Chemistry › Soil and Water Nutrient Dynamics
Keywords
forest fires, drinking water supply, forested watersheds, dissolved organic carbon, nitrogen, turbidity, soil erosion, coagulation efficiency, disinfection by-products, haloacetonitriles, chloropicrin, black carbon, soil heating, nutrient export, river discharge, water treatment, post-fire recovery, trihalomethanes
MeSH terms
Wildfires, Carbon, Fresh Water, Nitrogen, Water Pollutants, Chemical, Water Purification, Water Quality, Drinking Water, Forests

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review