# Boston-area Covid Wastewater Data
**URL:** https://talk.observablehq.com/t/boston-area-covid-wastewater-data/6281
**Category:** Show and tell
**Created:** [February 23, 2022, 5:49pm UTC](https://talk.observablehq.com/t/boston-area-covid-wastewater-data/6281 "2022-02-23T17:49:57Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@harris](https://talk.observablehq.com/u/harris)
#### Post date: [February 23, 2022, 5:49pm UTC](https://talk.observablehq.com/t/boston-area-covid-wastewater-data/6281/1 "2022-02-23T17:49:57Z")
I’ve been following MWRA’s covid wastewater data, but their charts lately have gotten a little hard to read. I made an interactive version that lets you swap between linear and log scale and narrow down the dates to look at.
One potentially general interest feature here is an example of using Observable Plot in combination with d3-brush.
> **[MWRA SARS-CoV-2 Wastewater Data](https://observablehq.com/@harrislapiroff/mwra-wastewater-data)**
>
> Latest reading: ( ) Samples are currently taken 3 - 7 times a week and analyzed by Biobot Analytics, a wastewater epidemiology company. Data are updated as received by Biobot following an internal review process. — Massachusetts Water Resources...
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### Author:  [@Fil](https://talk.observablehq.com/u/Fil)
#### Post date: [February 23, 2022, 6:12pm UTC](https://talk.observablehq.com/t/boston-area-covid-wastewater-data/6281/2 "2022-02-23T18:12:18Z")
Excellent example, thank you for sharing! You can track the progress on interactions in Plot in [brush, pointer by mbostock · Pull Request #721 · observablehq/plot · GitHub](https://github.com/observablehq/plot/pull/721) — not fully ready yet, but we’re getting closer. In the meantime if you want to work with a plugin you can try this branch [Plot.brush (#71) / Fil / Observable](https://observablehq.com/@fil/plot-brush-71)
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### Author:  [@harris](https://talk.observablehq.com/u/harris)
#### Post date: [February 23, 2022, 6:24pm UTC](https://talk.observablehq.com/t/boston-area-covid-wastewater-data/6281/3 "2022-02-23T18:24:36Z")
Oooh, thanks! As you can see from my usage of the onclick plugin you wrote I’ve been enjoying your experimental plot features, but I didn’t find that particular one 🙂