#9839. Identifying locations of sewage pollution within a Hawaiian watershed for coastal water quality management actions

September 2026publication date
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Journal’s subject area:
Environmental Science (all);
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Abstract:
Study region: Puak?, Hawai‘i Island. Study focus: Locations of sewage pollution in the Puak? watershed were identified through measurements of sewage indicators at groundwater wells and within Puak?’s and adjacent resorts’ shoreline waters. Dye tracer tests, water quality, ?15N macroalgal, and ?15N- and ?18O-NO3- measurements, along with stable isotope mixing models, were combined to assess water quality impairment caused by different Onsite Sewage Disposal System (OSDS) types, and used to predict water quality improvements from future management actions.
Keywords:
Dye tracer studies; FIB; Macroalgae; OSDS; Sewage; Stable nitrogen isotopes

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