The research findings revealed that boil water notices had varied impacts on real estate values. For properties within the lower 60 percent quantile, BWNs were found to have a statistically significant negative effect on residential values. Moreover, for properties that experienced both a BWN and a one-day water disruption, a decrease in property value was observed ranging from 0.6% to 8.4%. However, for high-priced houses falling within the 0.7 quantile, no noticeable decrease in property value was detected due to BWNs. Overall, the authors concluded that since most properties in the county experienced multiple water disruptions caused by BWNs, residential values were likely to have declined by approximately 1% to 10%. The findings imply that BWNs can have a detrimental effect on property values, particularly for lower-priced houses.
Remarkably, the study's findings indicated that there was no significant evidence of racial bias affecting appraised values when comparing black-owned homes to white-owned homes. Based on their thorough analysis, the authors concluded that racial bias did not seem to play a significant role in influencing appraised values in this specific refinance market.
The case studies demonstrated that innocent landowner programs positively affected property values. Properties within these programs maintained their values similar to unimpaired properties, indicating no diminution in value for non-source properties with a formal release of liability. The Innocent Landowner Program proved beneficial to property owners, preserving their property's value despite previous contamination issues.
The study found that areas with high Covid-19 case rates had a negative impact on the prices of single-family residences, as evidenced by hedonic modeling. Additionally, there was a significant negative correlation between residential sale volume and coronavirus case rates. Specifically, for every 1,000 increase in positive case rates in a particular zip code, single family homes experienced a 10% property value diminution (PVD).
The primary purpose of the repeat sales analysis was to quantify the impact on property values before and after the public became aware of the contamination issue. The findings revealed that the unregulated perchlorate contamination provided significant property value diminution to residential property values near the Olin Corporation Facility in California. The repeat sales approach demonstrated a property value diminution (PVD) of 21.82% for homes not affected directly by the contamination source.
The results derived from the hedonic analysis provided evidence of significant decreases in land values associated with shallow-flow groundwater contamination. In contrast, land values remained largely unaffected by deep-flowing contaminated groundwater. The OLS models demonstrated that properties predicted to have groundwater contamination based on geographic and topographic factors experienced a Property Value Diminution (PVD) of 17.55%. Additionally, land values of properties adjacent to contaminated water wells exhibited a PVD of 54%. The authors also acknowledged that their analysis may not completely account for the financial impacts of property contamination for parcels that have become unmarketable due to actual contamination or the potential risk of contamination.
The difference-in-differences regression model's initial output showed that buyers of single-family residential homes located 2000 and 1000 feet away from existing natural gas pipelines were willing to pay 1% to 3% less, respectively, after the explosion. However, the authors noted that it was challenging to determine whether the impacts were due to perceived or actual risks. Other model specifications did not reveal any significant impact on property values. In conclusion, the study suggested that pipeline risk can have a negative impact on housing market capitalization.
Before the explosion, residential properties had no statistically significant impacts from pipeline proximity for both the Trans Mountain and Olympic pipelines. After the explosion, the Olympic pipeline provided a statistically significant discount for single-family properties located near the pipeline. For homes 50 feet, 100 feet, 200 feet, and 1,000 feet away from the pipeline, the indicated discounts were 4.6%, 2.3%, 1.2%, and 0.2%, respectively. Upon further analysis, the authors observed that the Trans Mountain pipeline had no statistically significant impact after the explosion.
The results of the hedonic analysis showed that land with market awareness of documented contamination sold at an average 67% discount compared to unimpaired prices. Properties adjacent to a contamination source experienced a 42% diminution to land value. The study suggested that unconfirmed, presumed environmental source sites can also have impacted property prices. In this study, suspected contamination source sites had property prices 65% lower than unimpaired land value
The hedonic modeling provided evidence that single-family properties near a blue line and a proposed green line station benefited in the magnitude of 5.7% to 6.8%. After development, proximity to a station was found to be an amenity for both lines. Conversely, homes located near a railway without a station experience a decline in property values, with homes near the green line experiencing diminution five times greater when compared to blue line properties. For multifamily properties, model specifications were poor, and thus no conclusion could be made. Similarly, in terms of “value benefit transfer”, an 18% difference was observed. However, no conclusion could be made due to a lack of precision.
Given that the existing facility produced odor, the incremental impact of the expansion was stated to be small. In reconciliation, the appraiser concluded an overall diminution of 4% for the buildable area of the subject property. For industrial use, the impact was stated to be negative but less than residential in magnitude.
Before public awareness, properties within the potentially contaminated shallow groundwater plume garnered a 242% premium compared to similar unimpaired properties. After public attention, the premium dissipated completely. After listing on the NPL, the hedonic output revealed a considerable discount for properties within the shallow groundwater plume. A 69% to 77% diminution in value was observed for properties within the shallow groundwater plume. [2] Properties potentially impacted by deep groundwater and surface water contamination did not experience any statistically significant property value diminution in this study.