jj wedgworth, ms, phd candidate university of alabama department of biological sciences
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Low pressure and intermittent service are associated with reported symptoms of gastrointestinal illness in small water supplies. JJ Wedgworth, MS, PhD Candidate University of Alabama Department of Biological Sciences. Our Team. - PowerPoint PPT PresentationTRANSCRIPT
Low pressure and intermittent service are associated with reported symptoms of gastrointestinal illness in small water
supplies
JJ Wedgworth, MS, PhD CandidateUniversity of Alabama
Department of Biological Sciences
Our TeamJoe Brown PhD PE, London School of Tropical
Medicine and Hygiene, Principal InvestigatorPauline Johnson PhD, UA CCEE, Principle
InvestigatorJulie Olson PhD, UA Biological Sciences (co-PI)Christine Stauber PhD, GSU Environmental
Health (co-PI)Mark Elliott PhD, UA CCEEJJ Wedgworth, PhD candidate, UA Biological
SciencesPhillip Grammer MS, PhD student, UA CCEERick Forehand MS, UA CCEE alumnusDaniel Bunei MS, UA CCEE alumnus
OutlineBackground and
context: Alabama’s Black Belt
Pilot data and hypothesis generation
GoalsMethods overviewPreliminary data Next steps
Alabama’s Black BeltCommon Demographic and
Socio-economic CharacteristicsHigh PovertyHigh UnemploymentDecreasing PopulationHigh Percentage of Minorities
Common ThemesDecaying infrastructurePoor access to basic services
and health careHigh percentage of vulnerable
people (the young, elderly and infirm)
2010 Black Belt in ComparisonCounty 1 County 2 County 3 Alabama US
Population 15,421 13,478 11,482 4,802,740 311,591,917
Population Change
-2.2% -2.1% -1.6% 0.5% 0.9%
Population Density/mi2
24.5 15.4 13.1 94.4 87.4
Living in Poverty
24.6% 34.8% 38.5% 17.1% 13.8%
Median Income
$29,299 $25,338 $23,491 $42,081 $51,914
Public Water 81.5% 91.4% 61.7% 89% 86%
On-site Septic
60.3% 55.4% 53.7% 43.6% 24.1%
“non-perc” soils
77% 74% 83% NA NA
PWS Violations Alabama 1997-2012Type of systems Populatio
n servedViolations: HAA
Violations: TTHMs
Violations: coliform
Total violations
Total violations per 100,000 people
Large (10,001-100,000) 4,136,225 15
28 100 143 3
Top third per capita income 3,248,710 11
15 51 77 2
Middle third per capita income 664,795 4
5 21 30 5
Lower third per-capita income 222,720 0
8 28 36 16
Medium (3,301-10,000) 1,027,417 38
69 160 267 26
Top third per capita income 408,615 10 25 50 85 21 Middle third per capita income 384,255 23
23 58 104 27
Lower third per-capita income 234,547 5
21 52 78 33
Small (501-3,300) 362,352 65 128 273 466 129 Top third per capita income 124,756 13 25 70 108 87 Middle third per capita income 139,053 34
74 107 215 155
Lower third per-capita income 98,543 18
29 96 143 145
Very Small (<500) 11,168 11 13 42 66 591 Top third per capita income 2,547 6
1 9 16 628
Middle third per capita income 3,928 4
9 10 23 586
Lower third per-capita income 4,693 1
3 23 27 575
Total 5,537,162 129 238 575 942
17
> 8x
197x
L Talebi
> 40x
Small Rural System Challenges1. More than 94 percent of the nation’s 156,000 public water systems serve fewer than 3,300 persons (EPA 2009). This results in wide service areas with disperse populations. 2. Small-scale, decentralized, or rural systems may be particularly susceptible to problems as infrastructure ages (ADPH 2009). Aging infrastructure leads to an increase in operation and maintenance challenges.3. All of these issues combined make it increasingly more difficult for systems to meet the regulatory requirements.
– Water Quality and Wastewater survey in 3 Counties:• 14 water systems, 900 households, 18
months
1. Assess public health impacts associated with small, rural water supply system performance and water quality.
2. Conduct microbial risk assessments to identify sources of microbial contamination. Propose risk reduction strategies for rural systems.
3. Identify possible transmission pathways for waterborne pathogens.
4. Identify low-cost, practicable, sustainable risk mitigation strategies to protect public health.
EPA-STAR
Household level Health Data surveysPOU Water Quality
Flamed/Un-flamed samples
System level Water distribution:
System attributes, upgrades, O&M
OSS Wastewater system evaluation
Data Collection
Field and Lab Quality Testing
Parameters
Physical Turbidity, Pressure
Chemical Free &
Total Cl, pH
Dead End Ultrafiltrati
on for Identificatio
n of Pathogens
System Performan
ce Data
Microbial source
tracking
Not in the Job Description
Household Level Water Sampling
A total of 900 households were visited and samples were taken from faucets (grab samples) and from outdoor taps (flamed samples)
16.7% of all flamed samples were + for total coliforms
12.2 % of all grab samples were + for total coliforms
< 1% of either type of samples were positive for E. coli
FIB contamination was not associated with any reported symptom of gastrointestinal illness (diarrhea, vomiting, nausea or abdominal cramping)
Low Pressure, Intermittent Service and GI Symptoms
Reports of low water pressure were associated with any symptoms of GI illness, reported watery diarrhea and vomiting.
Reported intermittent service was also associated with reported symptoms of GI illness, watery diarrhea and vomiting.
Measured vs Reported Water Pressure0
50
100
150
Pre
ssure
1 (
psi
)
Very Strong Strong Moderate Weak Very Weak
SummaryRelatively high percentage of samples
positive for TC, lower than expected number of E. coli positives.
Significant health associations emerging with some water quality measures including reported low pressure and intermittent service.
No association with reported sanitation conditions.
Data collection and analysis are ongoing System-level samples are of central importance
to study questionsAt-risk areas emerging when merging
household and system data
Next StepsSystem Level Samples
10 sample points for each system chosen based on location within the system and areas of vulnerability
100 liter sample taken at each sample point4 time pointsSample analyzed for:
pH, turbidity, pressure, free and total chlorine Total coliform, E. coli, and Enterococci by IDEXX Coliphage by Single Agar Layer-EPA 1602 Heteroptrophic Plate Count Cryptosporidium, Giardia, norovirus, adenovirus,
and potentially others
AcknowledgmentsAll Project Staff and
StudentsCDCEmory UniversityUniversity of AlabamaGeorgia State UniversityLSTMHLocal Water System
OperatorsCommunity PartnerHousehold participants
FundingDepartment of
Biological SciencesCenter for Community
Based Partnerships (CCBP)
EPA STAR
***DISCLAIMER: Although the research described in the article has been funded wholly or in part by the United States Environmental Protection Agency through grant R834866 to the University of Alabama and Georgia State University, it has not been subject to the Agency’s required peer and policy review and therefore does not necessarily reflect the views of the Agency and no official endorsement should be inferred.
QUESTIONS?