Operations Statistics

Overview

How to Interpret Operations Statistics

Operations statistics tell us what kind of work our vector control technicians spent their time on in the past month. These numbers are useful for helping us make decisions about how to allocate resources or what programs to focus on.

Tables of acres treated refer to larger sources of standing water where mosquitoes may develop. Numbers of sourced treated include smaller residential sources of standing water, such as swimming pools and backyard containers.

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Service Requests in March 2020

This table contains the number of each type of service request in March 2020 compared to the five-year average in March. Total service requests are lower this March compared to the five-year average. This variance is largely because the District pared back operations, including service requests, in observance of the county and state-wide shelter-in-place orders issued in mid-March.

Type of Request

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Service Requests in February 2020

This table contains the number of each type of service request in February 2020 compared to the four-year average in February. Total service requests are somewhat higher this February than the four-year average. This variance is largely because of slightly higher numbers of mosquito, yellow jacket, and mosquito fish requests, perhaps because of early spring-like temperatures. The “Other” category of requests in February included as variety of service calls, including complaints about crane flies, broken pipes, ticks, bees and flies.

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Service Requests in January 2020

This table contains the number of each type of service request in January 2020 compared to the four-year average in January. Total service requests are somewhat higher this January than the four-year average. This variance is largely because of slightly higher numbers of mosquito, yellow jacket, and rodent service requests, a shift from December, when all these categories were fewer than average.

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Service Requests in November 2019

Service requests of all types tend to increase in warmer months, but this summer saw a large spike in requests related to yellowjackets and wasps. These requests are decreasing along with outdoor temperatures as we move into winter.

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Service Requests in October 2019

The largest increase in service calls during 2019 was for yellow jackets.  This may be due to ongoing drought conditions or an increase in district awareness.  

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Service Requests in September 2019

This table contains the number of each type of service request in September 2019 compared to the four-year average in September. Total service requests are higher this September than the four-year average. The higher number is due to increased mosquito and yellowjacket reqeusts. Dead birds are lower than usual this summer, because there has been no West Nile virus activity in the Bay Area this season.

August Service Requests

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Service Requests in August 2019

This table contains the number of each type of service request in August 2019 compared to the four-year average in August. Total service requests are higher this August than the four-year average. The higher number is largely because of 608 yellowjacket and wasp service requests, which is a record month for the District. Mosquito service requests are near average, even though trap collections show above average mosquito population abundance this summer. Dead birds are lower than usual this summer, because there has been no West Nile virus activity in the bay area this season.

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Acres treated with larvicide in August 2019

This table shows the number of acres treated with larvicide during 2019. A large number of acres treated in August were marshes and impounds is especially high, mostly by helicopter in tules that are not accessible by foot. Creeks and catch basins were also treated on a regular schedule during August During the summer months, vector control technicians walk through creeks and treat pockets of standing water that can breed mosquitoes.

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Service Requests in July 2019

This table contains the number of each type of service request in July 2019 compared to the four-year average in July. Total service requests are higher this July than the four-year average. The increase is because of a spike in yellowjacket and wasp service requests, which are a seasonal problem. Dead birds are lower than usual this summer, because there is no West Nile virus activity in the bay area yet this summer.

July Service Requests

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Acres treated with larvicide in July 2019

This table shows the number of acres treated with larvicide during 2019. The number of acres treated in marshes and impounds is especially high, mostly because of helicopter treatments of three sites with tules. Creeks and catch basins were also treated consistently in July, although these make up substantially less acreage. During the summer months, vector control technicians walk through creeks and treat pockets of standing water that can breed mosquitoes.

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Acres treated with larvicide in June 2019

This table shows the number of acres treated with larvicide during 2019. The highest proportion of acres treated remains marshes and impounds, in addition to nearly as much acreage treated in creeks. During the summer months, vector control technicians walk through creeks and treat pockets of standing water that can breed mosquitoes. The seasonal catch basin treatment program, which began in May and continues until heavy fall rains is also a significant part of the summer mosquito control program. 

 

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Acres treated with larvicide in May 2019

This table shows the number of acres treated with larvicide during 2019. The highest proportion of acres treated remains marshes and impounds, although the acreage continues to decrease as some of these sources evaporate. Sewage treatment plants needed a higher amount of larvicide treatment during May than previous months. Treatment plants can produce considerable numbers of mosquitoes during summer months, as they hold a number of standing water sources. The seasonal catch basin treatment program started in May, and will be a significant part of summer mosquito control operations.

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Acres treated with larvicide in April 2019

This table shows the number of acres treated with larvicide during 2019. The highest proportion of acres treated remains marshes and impounds, although the amount is considerably less in April than March.  This number will continue to decline as the weather continues to warm and remain dry. The acreage of catch basins is higher an April than March because some of these sources are beginning to breed. The seasonal catch basin treatment program starts in May, and these sources will be a significant part of summer mosquito control operations.

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Acres treated with larvicide in March 2019

This table shows the number of acres treated with larvicide during 2019. Seasonal marshes and impounds remain full of water and are breeding mosquitoes.  The mosquito larvae are treated with larvicide as they reach the optimal growth stage to prevent emergence of adult mosquitoes. These sources will continue to need treatment until they evaporate during the dry season.

Source Type

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Acres Treated with Larvicide in January and February 2019

This table shows the number of acres treated with larvicide during January and February. Seasonal marshes and impounds remain full of water and are breeding mosquitoes.  The mosquito larvae are treated with larvicide as they reach the optimal growth stage to prevent emergence of adult mosquitoes. These sources will continue to need treatment until they evaporate during the dry season.

Source Type

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Acres Treated with Larvicide in January 2019

This table below shows the number of acres treated with larvicide during January. The number of acres treated this month is considerably higher than in December (2.04 acres). Seasonal marshes and impounds are now full of standing water and breeding mosquito larvae. The mosquito larvae are treated with larvicide as they reach the optimal growth stage. The number of acres treated will continue to remain high at marshes and impounds as long as rainy weather continues.

 

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Acres Treated with Mosquito Larvicide in November and December 2018

This table shows the number of acres treated with larvicide during November and December. The number of acres treated during these months is low. Technicians are currently monitoring sources for mosquito larvae as they fill with water. The mosquito larvae are treated with larvicide when they reach the optimal growth stage. The number of acres treated will likely increase substantially in January, especially in marshes and impounds, depending on rainfall. 

 

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Service Requests in November 2018

This table contains the number of each type of service request in November 2018 compared to the three-year average in November.  The total number of service requests is somewhat below average, mainly because we have had fewer than typical mosquito-related requests. The number of yellowjacket and wasp service requests continued in a steep decline, shown in the graph, and will likely remain low until spring.

 

Type of Service Request

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Acres Treated with Mosquito Larvicide in October 2018

This table shows the number of acres treated with larvicide during September and October. The number of acres treated is drastically lower in October compared to September, largely from the marshes and impounds category. Helicopter treatments were not conducted during the month of October, which is a large part of summer acreage treated. Also, after a dry summer and mostly dry autumn thus far, there is less standing water throughout the county. Creeks and catch basins are continuously treated in summer.

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Service Requests in October 2018

This table contains the number of each type of service request in October 2018 compared to the three-year average in October.  Total number of service requests are above average, mainly because of yellow jacket and wasp requests. Dead birds were also somewhat higher than average this October.

Type of Request

October 2018

Commands