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Description: Bacteria in Residential Subwatersheds is not Widespread — Results from a...
Bacteria in Residential Subwatersheds is not Widespread — Results from a Residential Property-Scale Water Quality Study
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Description: Bacteria in Residential Subwatersheds is not Widespread — Results from a...
Bacteria in Residential Subwatersheds is not Widespread — Results from a Residential Property-Scale Water Quality Study

Bacteria in Residential Subwatersheds is not Widespread — Results from a Residential Property-Scale Water Quality Study

Bacteria in Residential Subwatersheds is not Widespread — Results from a Residential Property-Scale Water Quality Study

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Description: Bacteria in Residential Subwatersheds is not Widespread — Results from a...
Bacteria in Residential Subwatersheds is not Widespread — Results from a Residential Property-Scale Water Quality Study
Abstract
A fecal bacteria source evaluation study was implemented in two southern California communities to characterize bacteriological water quality in dry weather irrigation excess runoff from residential drainage areas. Unlike rainfall-driven runoff where rain is spread across a watershed, the primary source of dry weather flow in the studied urban catchments is outdoor water use by individual properties. Spatial variability in property-specific bacteria water quality yields may cause extreme fluctuation observed in downstream monitoring data. To test this hypothesis, the property-scale dry weather bacteria study sought to characterize E. coli concentrations in dry weather flow resulting from irrigation of residential properties in Chino and Chino Hills. Numerous factors affect which properties would create offsite runoff at the time a downstream sample is collected, including irrigation schedules, irrigation system efficiency and timing of other outdoor water uses, which are a function of the routine of each property’s residents. To develop statistically significant results, sites for sample collection were randomly selected. Samples were collected downstream of 80 properties in the 2014 dry season. Results for E.coli concentration fit a lognormal distribution with a geometric mean close to the water quality objective (126 cfu/100mL). Local watershed managers recognize the potential benefit of identifying certain behaviors or the presence of certain hosts as more likely to produce elevated bacterial indicators in irrigation excess dry weather flow. It may then be effective to implement source control practices targeting such behaviors or hosts, and, if implemented across a watershed, could yield significant improvements to receiving water quality during dry weather conditions.
A fecal bacteria source evaluation study was implemented in two southern California communities to characterize bacteriological water quality in dry weather irrigation excess runoff from residential drainage areas. Unlike rainfall-driven runoff where rain is spread across a watershed, the primary source of dry weather flow in the studied urban catchments is outdoor water use by...
Author(s)
Steven WolosoffRick ChappellTad GarretyRuben ValdezMarc Rodabaugh
SourceProceedings of the Water Environment Federation
SubjectResearch Article
Document typeConference Paper
PublisherWater Environment Federation
Print publication date Sep, 2015
ISSN1938-6478
DOI10.2175/193864715819540513
Volume / Issue2015 / 14
Content sourceWEFTEC
Copyright2015
Word count269

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Description: Bacteria in Residential Subwatersheds is not Widespread — Results from a...
Bacteria in Residential Subwatersheds is not Widespread — Results from a Residential Property-Scale Water Quality Study
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Description: Bacteria in Residential Subwatersheds is not Widespread — Results from a...
Bacteria in Residential Subwatersheds is not Widespread — Results from a Residential Property-Scale Water Quality Study
Abstract
A fecal bacteria source evaluation study was implemented in two southern California communities to characterize bacteriological water quality in dry weather irrigation excess runoff from residential drainage areas. Unlike rainfall-driven runoff where rain is spread across a watershed, the primary source of dry weather flow in the studied urban catchments is outdoor water use by individual properties. Spatial variability in property-specific bacteria water quality yields may cause extreme fluctuation observed in downstream monitoring data. To test this hypothesis, the property-scale dry weather bacteria study sought to characterize E. coli concentrations in dry weather flow resulting from irrigation of residential properties in Chino and Chino Hills. Numerous factors affect which properties would create offsite runoff at the time a downstream sample is collected, including irrigation schedules, irrigation system efficiency and timing of other outdoor water uses, which are a function of the routine of each property’s residents. To develop statistically significant results, sites for sample collection were randomly selected. Samples were collected downstream of 80 properties in the 2014 dry season. Results for E.coli concentration fit a lognormal distribution with a geometric mean close to the water quality objective (126 cfu/100mL). Local watershed managers recognize the potential benefit of identifying certain behaviors or the presence of certain hosts as more likely to produce elevated bacterial indicators in irrigation excess dry weather flow. It may then be effective to implement source control practices targeting such behaviors or hosts, and, if implemented across a watershed, could yield significant improvements to receiving water quality during dry weather conditions.
A fecal bacteria source evaluation study was implemented in two southern California communities to characterize bacteriological water quality in dry weather irrigation excess runoff from residential drainage areas. Unlike rainfall-driven runoff where rain is spread across a watershed, the primary source of dry weather flow in the studied urban catchments is outdoor water use by...
Author(s)
Steven WolosoffRick ChappellTad GarretyRuben ValdezMarc Rodabaugh
SourceProceedings of the Water Environment Federation
SubjectResearch Article
Document typeConference Paper
PublisherWater Environment Federation
Print publication date Sep, 2015
ISSN1938-6478
DOI10.2175/193864715819540513
Volume / Issue2015 / 14
Content sourceWEFTEC
Copyright2015
Word count269

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Steven Wolosoff# Rick Chappell# Tad Garrety# Ruben Valdez# Marc Rodabaugh. Bacteria in Residential Subwatersheds is not Widespread — Results from a Residential Property-Scale Water Quality Study. Alexandria, VA 22314-1994, USA: Water Environment Federation, 2018. Web. 1 Oct. 2025. <https://www.accesswater.org?id=-277945CITANCHOR>.
Steven Wolosoff# Rick Chappell# Tad Garrety# Ruben Valdez# Marc Rodabaugh. Bacteria in Residential Subwatersheds is not Widespread — Results from a Residential Property-Scale Water Quality Study. Alexandria, VA 22314-1994, USA: Water Environment Federation, 2018. Accessed October 1, 2025. https://www.accesswater.org/?id=-277945CITANCHOR.
Steven Wolosoff# Rick Chappell# Tad Garrety# Ruben Valdez# Marc Rodabaugh
Bacteria in Residential Subwatersheds is not Widespread — Results from a Residential Property-Scale Water Quality Study
Access Water
Water Environment Federation
December 22, 2018
October 1, 2025
https://www.accesswater.org/?id=-277945CITANCHOR