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Karen DuBoseMarch 11, 2009
The SituationCorvallis’ wastewater treatment plant will
exceed its TMDL water quality requirements as the city grows
Wastewater recycling is an excellent solutionNo need to discharge
into the riverAdvances the city’s
sustainability ethic
Goals of this studyDiscover what factors
influence the public acceptance of water reuse in Corvallis
Make recommendations to the city about how to pursue a wastewater recycling project
Factors that have been found to influence public opinion
AgeGenderEducationIncomeOccupationLength of residenceDegree of contactPrior knowledge of
water reuse
Awareness of water problems
Presence of childrenTrust in local public
utility Health effectsEnvironmental effectsCost of projectPublic opinion of reuse
Methods
December 2008 survey of registered voters, 46% response rate
19 questions, six were demographicMultiple linear regression
A model of public acceptance in Corvallis
Acceptance = β0 + β1(Informed) + β2(Knowledge) +
β3(Aware) + β4(Sustainability) + β5(Trust) +
β6(Gender) + β7(Age) + β8(Children present) +
β9(Education)
Dummy variables: knowledge, aware, gender, age, children present
Q-4 For the following terms, please indicate if you know what the term means, have heard of the term but don’t know its meaning, or have not heard of the term at all.
Have not heard of the term at all
Have heard of the term but don’t know
its meaning
Know what the term means
a. Potable water1 2 3
b. Wastewater 1 2 3
c. Greywater1 2 3
d. Sewage1 2 3
e. Recycled water1 2 3
f. Effluent1 2 3
Measuring knowledge
Measuring sustainability ethicQ-6 How important are each of the following when choosing an approach to meeting the new
water quality regulations in the Willamette River? If you have no opinion of one, please leave it blank.
Not Important
at All
Limited Importance
Somewhat Important
Important Very Important
a. Prevent pollution 1 2 3 4 5
b. Protect human health 1 2 3 4 5
c. Be a long term solution 1 2 3 4 5
d. Be energy efficient 1 2 3 4 5
e. Be financially sound 1 2 3 4 5
f. Protect fish and wildlife 1 2 3 4 5
g.Have low greenhouse gas emissions
1 2 3 4 5
Acceptance of recycled water usesQ-7 How much do you favor the use of recycled wastewater for each of the following? If you don’t know or
have no opinion of a use, please leave it blank.Highly
UnfavorableUnfavorable Neutral Favorable Highly
Favorable
a. Irrigate golf courses1 2 3 4 5
b.Irrigate landscaping in business parks
1 2 3 4 5
c. Irrigate public parks1 2 3 4 5
d. Irrigate school grounds 1 2 3 4 5
e.Irrigate non-edible agricultural crops (grass)
1 2 3 4 5
f.Irrigate agricultural crops for human consumption
1 2 3 4 5
g. Use in industrial processes1 2 3 4 5
h. Use to cool buildings1 2 3 4 5
i.Flush toilets in public buildings
1 2 3 4 5
j.Supply fire hydrants in the city
1 2 3 4 5
k. Supply car wash businesses1 2 3 4 5
Percentage of respondents choosing "very favorable" or "favorable" for various recycled water uses.
Grouping uses of recycled water
Factor analysis looks for patterns in responses3 groups of recycled water uses:
High contact (irrigate schools, public parks, edible crops)
Low contact (irrigate business parks, golf courses, non-edible crops, use in industrial processes)
Other uses (building cooling, toilet flushing, fire hydrants, car washes)
Factor scores were used in 3 regressions, one for each group
Regression coefficients for factors of water reuse acceptance
Independent Variable High Contact Low Contact Other Uses
Informed-0.018(0.794)
-0.088(0.184)
-0.093(0.157)
Knowledge of wastewater0.004
(0.909)0.100
(0.009)0.059
(0.120)
Aware of problem (1=yes)-0.394(0.000)
-0.019(0.862)
-0.043(0.694)
Sustainability index0.026
(0.051)0.022
(0.101)0.040
(0.003)Trust to serve public interest
0.111(0.109)
0.125*(0.067)
0.080(0.237)
Gender (1=male)0.279
(0.004)-0.208(0.029)
0.068(0.474)
Age-0.003(0.324)
-0.003(0.306)
-0.003(0.355)
Education-0.020(0.627)
0.029(0.485)
0.090(0.028)
Children present (1=no)-0.045(0.663)
-0.165(0.104)
0.172*(0.088)
P-values for the coefficients are in parenthesis. Red values are significant at 95%; * denote significance at 90%.
Policy implications
City should pursue water reuse; there is high acceptance of most uses
Low contact uses are most acceptedMake sure a program adheres to the
principles of sustainability Educate public about wastewater treatment,
water reuse, technologies, and reason for water reuse
If high contact uses are chosen, make a special effort to include women
Study limitations
Results should be considered hypotheticalStudies show that factors influencing acceptance
change when specific plans are presented
Little information about water reuse was presented due to spaceMany respondents stated they wanted more information
Questions?
Support provided by
Institute for Water and Watersheds
Master of Public Policy Program