Outdoor Residential Water Use Research Articles

Policy Note: An Alternative Approach to Designing Tariffs for Household Water Use: The Case of Los Angeles

Water Economics and PolicyOnline Ready No AccessPolicy Nook — Policy Note: An Alternative Approach to Designing Tariffs for Household Water Use: The Case of Los AngelesMichael HanemannMichael HanemannDepartment of Economics, Arizona State University USAhttps://doi.org/10.1142/S2382624X22710047Cited by:0 PreviousNext AboutSectionsView articleView Full TextPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail View article References Araya, F, K Osman and KM Faust [2020] Perceptions versus reality: Assessing residential water conservation efforts in the household. Resources. Conservation and Recycling, 162, 105020. Crossref, Google Scholar Attari, SZ [2014] Perceptions of water use. Proceedings of the National Academy of Sciences, 111(14), 5129–5134. 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Crossref, Google Scholar FiguresReferencesRelatedDetails Recommended Online Ready Metrics History Published: 20 February 2023 PDF download

Is less always more? Conservation, efficiency and water education programs

Water scarcity and stress are not new phenomena for many regions around the world. Problems are exacerbated by growing populations, changing weather patterns and reduced water supplies, associated with longer run climatic change. To help mitigate the problems, consumer conservation programs, including education programs directed at outdoor water use, have been created. We analyze the impact of one such program - the “WaterSmart” workshop offered by the largest water utility in New Mexico located in the southwestern United States. The utility's objective was for residential customers to water to their landscape needs. We find the program's impact varied by time, weather, and customer type. The program reduced average household water use, with impacts decaying quickly up to a two-month lag. Further, while water use declined under mild drought conditions, it increased during extreme drought. Finally, water use always increased for low-usage households. These findings suggest that the program increased residential outdoor water use efficiency, while the conservation impact depended on weather conditions and household characteristics. This suggests that water shortages in the short run could be ameliorated or exacerbated, depending on conditions, as the trade-offs between efficient maintenance of urban vegetation and water saving are considered.

Homeowner perceptions of watering restriction scenarios in the Minneapolis–St. Paul metropolitan area

AbstractTurfgrass‐dominated residential yardscapes are an important component of urban ecological landscapes. These spaces provide a multitude of benefits both ecological (e.g., water filtration) and social (e.g., recreation). However, yardscapes can require significant amounts of input such as fertilizers, herbicides, and more critically water. Residential outdoor water use has been extensively studied in water‐scarce areas (e.g., southwestern United States) but water supply issues are also beginning to impact previously water‐rich regions. One tool a municipality can use to control water usage is residential watering restrictions. Despite past research on the outcomes of such watering restrictions, few studies have tried to understand the perceptions of how homeowners subject to such restrictions feel about them. The current study addresses two critical gaps: first to understand homeowner perceptions of common watering restriction types and their likelihood to water, and second to expand the geographic scope of water use research by targeting a nonwater‐scarce area. We conducted an online survey of homeowners in the Twin Cities metropolitan area (TCMA) in Minnesota. Overall, homeowners held moderately favorable views towards three theoretical restriction scenarios and were about equally as likely to water across scenarios compared to no restrictions. Attitudes and perceptions of restrictions saving water drove favorability; conversely, the presence of irrigation systems predicted increased watering likelihood across scenarios. Strategies to reduce water use and achieve conservation goals in nonwater‐scarce areas should include assessment of resident perceptions of watering restrictions alongside sustained education campaigns.

Optimization of residential green space for environmental sustainability and property appreciation in metropolitan Phoenix, Arizona

Cities in arid and semi-arid regions have been exploring urban sustainability policies, such as lowering the vegetation coverage to reduce residential outdoor water use. Meanwhile, urban residents express concerns that such policies could potentially impact home prices regardless of the reduced water costs because studies have shown that there is a positive correlation between vegetation coverage and home values. On the other hand, lower vegetation coverage in arid and semi-arid desert regions could increase surface temperatures, and consequently increases energy costs. The question is therefore where the point in which residential outdoor water use can be minimized without overly increasing surface temperatures and negatively impacting home values. This study examines the impacts of spatial composition of different vegetation types on land surface temperature (LST), outdoor water use (OWU), and property sales value (PSV) in 302 local residential communities in the Phoenix metropolitan area, Arizona using remotely sensed data and regression analysis. In addition, the spatial composition of vegetation cover was optimized to achieve a relatively lower LST and OWU and maintain a relatively higher PSV at the same time. We found that drought-tolerant landscaping that is composed of mostly shrubs and trees adapted to the desert environment is the most water efficient way to reduce LST, but grass contributes to a higher PSV. Research findings suggest that different residential landscaping strategies may be better suited for different neighborhoods and goal sets can be used by urban planners and city managers to better design urban residential landscaping for more efficient water conservation and urban heat mitigation for desert cities.

Outdoor Residential Water Use Restrictions during Recent Drought Suppressed Disease Vector Abundance in Southern California.

The California state government put restrictions on outdoor residential water use, including landscape irrigation, during the 2012-2016 drought. The public health implications of these actions are largely unknown, particularly with respect to mosquito-borne disease transmission. While residential irrigation facilitates persistence of mosquitoes by increasing the availability of standing water, few studies have investigated its effects on vector abundance. In two study sub-regions in the Los Angeles Basin, we examined the effect of outdoor residential water use restrictions on the abundance of the most important regional West Nile virus vector, Culex quinquefasciatus. Using spatiotemporal random forest models fit to Cx. abundance during drought and non-drought years, we generated counterfactual estimates of Cx. abundance under a hypothetical drought scenario without water use restrictions. We estimate that Cx. abundance would have been 44% and 39% larger in West Los Angeles and Orange counties, respectively, if outdoor water usage had remained unchanged. Our results suggest that drought, without mandatory water use restrictions, may counterintuitively increase the availability of larval habitats for vectors in naturally dry, highly irrigated settings and such mandatory water use restrictions may constrain Cx. abundance, which could reduce the risk of mosquito-borne disease while helping urban utilities maintain adequate water supplies.

A multilevel analysis of the drivers of household water consumption in a semi-arid region

Communities across the Western United States face the growing challenge of managing water resources in the face of rapid population growth and climate change. There are two contrasting approaches to understanding and managing residential water demand in this context. Many scientists and water managers see water use as a reflection of individual attitudes and decisions where people are assumed to have the agency to act independently of structural constraints. Conversely, other scientists and policymakers focus on the importance of the built environment and the broader social, economic, and policy contexts within which households make water decisions. Using multilevel models, we compared attitudinal, demographic, and structural drivers of indoor and outdoor residential water use for a sample of households in Northern Utah. We estimated multilevel mixed-effect Poisson models with robust standard errors using matched household survey data with metered residential water use records. Outdoor water use had a substantially greater amount of neighborhood-level variation than indoor water use. Structural factors generally eclipsed individual agency in our analysis. While indoor use was most strongly predicted by household size, tenure status, and length of residence, outdoor water use was most associated with the built environment (lot size and the presence of vegetable gardens and underground sprinklers), socioeconomic status (household income, rental status), and residents' sensitivity to lawn watering norms. Higher water prices were associated with lower water use, with lower-income households being more responsive to prices than higher-income households. Our findings have important implications for water managers and policymakers.

Determinants of Landscape Irrigation Water Use in Florida-Friendly Yards.

Efforts to mitigate outdoor water use in Florida's urban landscapes increasingly include promotion of regionally appropriate landscaping based on its documented effectiveness. Targeted initiatives, however, require an understanding of mechanisms underpinning low irrigation use in single-family homes with Florida-Friendly Landscaping (FFL). This paper reports survey research conducted in southwest Florida to identify factors associated with irrigation practices among FFL clients. Results indicate that approximately half of survey participants irrigated less frequently than once per week year-round. Aesthetic considerations, horticultural knowledge, and membership in a homeowner's association (HOA) with rules regarding yard care were key variables underlying landscape characteristics and maintenance, while property values, water conservation attitudes, lawn grass, and in-ground irrigation system use significantly predicted irrigation practices. Homes with in-ground irrigation systems were more than six times more likely to water their landscapes at least once per week during the warm season when residential outdoor water use is at its peak. A $100,000 increase in a home's market value increased the odds of weekly watering by a multiplicative factor of two, whereas a one-point increase in a six-item Likert scale used to measure a homeowner's water conservation attitude decreased the odds by 76%. Homes with no grass in the landscape were 71% less likely to water on a weekly basis. Providing homeowners, and HOAs, with educational resources that build on existing support for water conservation could augment adoption of low maintenance plants and sustainable practices in Florida's urban landscapes.

Evaluating the efficacy of an information-based residential outdoor water conservation program

Abstract Information-based policy instruments are some of the most commonly used tools for influencing consumers' water use in the residential sector. However, their ability to change behavior remains an area in need of further research. This study describes the evaluation of an information-based demand management program, rooted in normative comparison, designed to increase the efficiency of households' residential outdoor water use. Results indicate that the program had an impact on water use among households that received persuasive messages regarding their past consumption, compared to estimates of lawn water requirements and the water use of neighbors. Additionally, the results demonstrate that the treatment effect gets stronger over time and varies among message recipients as a function of baseline water use. Unanticipated effects of the administration of the messages show an increase in water use among the lowest consuming households. Top users reduced their water use significantly as a function of the persuasive message. The findings suggest that utilities seeking to augment users' water consumption through persuasion must be cognizant of the way that messages are framed, and who receives them, or potentially face unanticipated side effects, and that message repetition may have some additionality.

Predicting Satisfaction with Smart Irrigation Controllers and Their Long‐Term Use among Homeowners in Central Florida

AbstractStudies throughout Florida have shown smart controllers can substantially reduce irrigation under residential high‐water use conditions. However, successful promotion requires understanding the link between controller performance and the mechanisms by which they are adopted. This article compares irrigation water‐use and survey data collected from households installed with soil moisture sensor and evapotranspiration controllers. The study investigated whether the relative change in irrigation use between two years preceding and two years following installation was a reliable predictor of a homeowner's satisfaction with the device and likelihood of continuing to use it. Results indicated relative changes in irrigation use were only significantly associated with the quality of controller programming. Satisfaction with the controller was largely attributable to satisfaction with the appearance of the landscape and the perceived water‐saving effectiveness of the controller whereas the likelihood of its continued use was only significantly predicted by the level of technical knowledge regarding its functioning and whether or not challenges were experienced with it. Targeting homeowners with supplemental user‐friendly information may best support their long‐term adoption of smart controllers while providing irrigation contractors with training in implementation techniques would represent an integrated strategy for added reductions in residential outdoor water use.

Economic Insight from Utah’s Water Efficiency Supply Curve

Across the western US, growing populations and urbanization along with environmental demands and a changing climate have strained water allocation mechanisms originally designed to provide water to agriculture. This paper provides a methodology, using Utah as an example, for examining the options for new water supply via conservation, interpretable by policymakers, water agencies, and water users. Findings indicate that the largest potential water savings, at the lowest cost, are in agriculture and outdoor residential water use, where more efficient applications can maintain the acreage of crops and lawns at current levels while dramatically reducing use.

An Augmented Norm Activation Model: The Case of Residential Outdoor Water Use

ABSTRACTUnderstanding the factors that influence voluntary conservation is critical for developing effective residential water conservation policy. Previous work drawing on Schwartz’s Norm Activation Model (NAM) has been useful to understand some of these factors. However, one’s relationship with the broader community impacted by consumptive decisions has often been overlooked. Similarly, scholars have emphasized the importance of contextual factors not captured in the NAM. In this study we hypothesize and test an augmented NAM that incorporates community attachment, along with contextual variables (sociodemographic and household infrastructure), to understand the factors that lead to the development of moral obligations to conserve water and their relationship with residential outdoor water use. Results indicate personal norms, defined as a moral obligation to conserve water, are negatively related to outdoor water use, and that community attachment is a predictor of personal norms. Contextual factors are found to have an influence on outdoor water use.

Policy Frameworks Influencing Outdoor Water‐use Restrictions

AbstractWater‐use efficiency in the United States (U.S.) has improved in recent years. Yet continued population growth coupled with increasingly conservation‐oriented regulatory frameworks suggest that residential water suppliers will have to realize additional efficiency gains in coming decades. Outdoor water‐use restrictions (OWRs) appear to be an increasingly prevalent demand‐side management policy tool. To date little research has investigated the policy mechanisms that govern OWR adoption and influence the prevalence of OWRs. This article fills this gap with an assessment of state‐level policies influencing local‐level restrictions on residential outdoor water use in each of the 48 contiguous U.S. states, and with a detailed illustration of the cross‐scalar dynamic of one state's policy framework in practice. An examination of the implementation of OWRs in 24 neighboring towns in Massachusetts across the 2003‐2012 period indicates the interplay between state‐level and local‐level policies leads to OWRs implementation over extended time‐periods, even when drought conditions are not present. This finding suggests OWRs are being used as a tool for general‐purpose water conservation rather than as a stopgap measure justified by temporary water shortage conditions. Future research should investigate how local‐level water savings vary with differing state‐level approaches.

Residential outdoor water use in one East Texas community

Municipalities continue to implement efforts to encourage water conservation among residents. Landscape irrigation has been central to many of those conservation efforts. Reference evapotranspiration data is a tool that can be used in determining the appropriate amount of water to apply to amenity landscapes. Monthly water-use data for 3 years was examined in 1 neighborhood in Huntsville, Texas. The irrigated area for 1,229 residents was calculated and used to determine the depth of monthly irrigation for each residence. Replacement of 100% of local reference evapotranspiration data, minus rainfall, was used as a determinant of how much water to apply to the landscape each month for 3 years. Potential over-irrigation for each month was then compiled. Data expressed that over-irrigation was occurring among 99.51% of residents, of which 12% of these residents over-irrigated by at least 100,000 gallons in at least 1 month during the 36 month study. In 2011, the entire neighborhood of study over-irrigated by 21.2 million gallons. Outdoor water use accounted for 64% of the total water use by households. Average indoor water usage was 4,302 gallons per month. Based on the data overall, greater conservation efforts in landscape irrigation are crucial for Texas residents if water demands are to be met in the 21st century. Citation: Pannkuk TR, Wolfskill LA. 2015. Residential outdoor water use in one East Texas community. Texas Water Journal. 6(1):79-85. Available from: https://doi.org/10.21423/twj.v6i1.7009.

The Influence of Land Cover, Vertical Structure, and Socioeconomic Factors on Outdoor Water Use in a Western US City

To help inform urban water conservation and planning, we evaluated spatial patterns and correlative relationships among physical land cover properties, socioeconomic and demographic characteristics, and single-family outdoor residential water use in Aurora, Colorado, a rapidly-growing suburb in the semi-arid Colorado Front Range. Using high resolution land cover maps and lidar-derived vertical structural data, we quantified land cover composition and vertical structural characteristics for detached, single-family residential parcels. These data were combined with socioeconomic and demographic datasets from the 2010 US Census and local government agencies and used in Random Forest analyses of outdoor water use estimated from residential water meter records, with separate analyses conducted using parcels and census block groups as sampling units. Conditional variable importance measures from Random Forest analyses and comparisons of the predictive accuracy of models developed using subsets of explanatory variables were used to assess the relative importance of physical and socioeconomic variables in predicting outdoor water use. Models developed using the subset of land cover variables had the highest predictive accuracy, followed by vertical structural variables, and lastly, socioeconomic/demographic variables. At both the parcel and census block group scale, there was significant spatial clustering in outdoor water use as indicated by various spatial statistical analyses. Our approach demonstrates the value of high resolution land cover and structure data for understanding urban water use patterns and can be used for targeting water conservation efforts.

Effects of irrigated parks on outdoor residential water use in a semi-arid city

We investigate whether public park amenities act as a substitute for outdoor water use by single-family residential (SFR) households in semi-arid Tucson, AZ, USA. Specifically we account for the effects of a park's proximity, size, and greenness (measured by NDVI), as well as the presence of a public swimming pool. SFR households with and without home pools are analyzed separately. We control for SFR property attributes, including house size, age, yard size and property NDVI. Results suggest that SFR outdoor water use is influenced by the conditions of all parks within an 8km (5mile) street distance. We also find significant differences between the “with” and “without” home pool groups. Households with pools used more outdoor water per square meter of house, per year of house age and per unit of NDVI. Households without pools appeared to reduce outdoor use in response to nearby small parks and increased park NDVI. “With pool” households had the opposite response: they appeared to increase outdoor water use in response to these variables. However, “with pool” households did reduce their outdoor water use in response to nearby public pools. Medium and large parks were associated with increased outdoor water use for both groups. We conclude that public green space and pools can substitute for private versions of these amenities, and if well designed, can contribute to water demand management and urban sustainability. This may be an avenue for addressing water supply shortages in semi-arid cities and other areas where populations are growing but water supplies are finite.

Estimation of residential outdoor water use in Los Angeles, California

The current study analyzes existing methods for estimating outdoor use and landscape irrigation in highly developed residential areas across Los Angeles. Outdoor use was estimated using three methods: two methods described by the Pacific Institute and a third approach that utilizes remotely sensed vegetation and water billing data. Monthly individual water use records were provided by the Los Angeles Department of Water and Power (LADWP) for 2000–2010. This period includes voluntary and mandatory restrictions due to drought conditions across the state. Records were aggregated to the census tract level to protect customer privacy. The two Pacific Institute methods, which are based on water billing data, generally underestimate outdoor use due to assumptions that the lowest water consumption month represents indoor use, which is likely not the case in Los Angeles. The remote-sensing model developed between single-family water use and the Landsat normalized difference vegetation index (NDVI) surplus performed well in greener areas of the city and indicates that landscape irrigation use represents 54% of total single-family water use. The model also predicts an average decrease in landscaping irrigation of 6% and by 35% during voluntary and mandatory restrictions, respectively. Voluntary conservation and mandatory waste restrictions were less effective for higher income groups in the city, while more stringent pricing and non-pricing mandatory restrictions in FY2010 had similar effects across income groups. Study results contribute to a better understanding of the partitioning of Los Angeles residential water use and can be utilized to evaluate pricing structures and target water conservation efforts.

A system dynamics model to facilitate public understanding of water management options in Las Vegas, Nevada

Water managers increasingly are faced with the challenge of building public or stakeholder support for resource management strategies. Building support requires raising stakeholder awareness of resource problems and understanding about the consequences of different policy options. One approach that can help managers communicate with stakeholders is system dynamics modeling. Used interactively in a public forum, a system dynamics model can be used to explain the resource system and illustrate the effects of strategies proposed by managers or suggested by forum participants. This article illustrates the process of building a strategic-level system dynamics model using the case of water management in Las Vegas, Nevada. The purpose of the model was to increase public understanding of the value of water conservation in Las Vegas. The effects of policies on water supply and demand in the system are not straightforward because of the structure of the system. Multiple feedback relationships lead to the somewhat counterintuitive result that reducing residential outdoor water use has a much greater effect on water demand than reducing indoor water use by the same amount. The model output shows this effect clearly. This paper describes the use of the model in research workshops and discusses the potential of this kind of interactive model to stimulate stakeholder interest in the structure of the system, engage participant interest more deeply, and build stakeholder understanding of the basis for management decisions.