Dave Keiser

environmental economist at @resec_umass

[Alex Cohen @alexwcohen]

Join my team! We’re looking for Senior *Cross-Cutting* Researchers to make sure we maintain research quality as GiveWell scales our grantmaking over the next few years 🧵

[AERE @AereOrg]

📢 Out now in the 🌸May 2026 issue🌸of #JAERE! 📢
"Municipal Governments Under the Clean Water Act" by Rhiannon L. Jerch.
📎 Read it here: https://t.co/EdGKCySiR0

[Dave Keiser @DavidKeiserEcon]

@EPIConservation, @ewg, @gatesfoundation, @UnitedNationsDP, @WorldBankWater

[Dave Keiser @DavidKeiserEcon]

How do you measure drinking water pollution in America?
Turns out: with a lot of FOIA requests.
Our new working paper assembles a national database of U.S. drinking water pollution concentrations.
Here's what it took 🧵
w/ Bhash Mazumder @davidmolitor @_josephshapiro

[Dave Keiser @DavidKeiserEcon]

https://t.co/t3LpC1UVTw

[Joseph Shapiro @_josephshapiro]

💧New Paper
Water Works: Causes and Consequences of Safe Drinking Water in America

📉US drinking water pollution fell by HALF in 2003-2019

💰Safe Drinking Water Act $ helped

❤️Investments reduce mortality, benefit/cost ratio >20

w @DavidKeiserEcon BMazumder @davidmolitor
👇

[David Molitor @davidmolitor]

Does cleaning up drinking water save lives?

New paper: We link US federal drinking water investments to Medicare records and find they reduce mortality among older Americans, with benefit/cost ratio >20.

Thread on what we did...

w/ @DavidKeiserEcon Mazumder @_josephshapiro

[NBER @nberpubs]

US drinking water pollution has fallen rapidly; Safe Drinking Water Act loans reduce pollution and save lives. Analyzing 266 million pollution readings from Freedom of Information Act requests and Medicare data, from @DavidKeiserEcon, Bhashkar Mazumder, @davidmolitor, and @_josephshapiro https://t.co/HXlCuJeXlh

[Joseph Shapiro @_josephshapiro]

💧New Paper
Water Works: Causes and Consequences of Safe Drinking Water in America

📉US drinking water pollution fell by HALF in 2003-2019

💰Safe Drinking Water Act $ helped

❤️Investments reduce mortality, benefit/cost ratio >20

w @DavidKeiserEcon BMazumder @davidmolitor
👇

[Dave Keiser @DavidKeiserEcon]

Excited for this initiative and to have the opportunity to present at TSEE. Hope to see you online tomorrow!

[Antonio M. Bento @amb396]

Transatlantic Seminar on Environmental and Energy Economics
Monday, September 29 at 7:30 AM PST

Speaker: David Keiser (@DavidKeiserEcon)
University of Massachusetts Amherst

Gross External Damages of Water Pollution in the United States

[Dave Keiser @DavidKeiserEcon]

@alexwcohen @AEAjournals thanks! shout-out to an amazing team - @Tina_Andarge, @DaliaAGhanem, and Gabe Lade.

[AEA Journals @AEAjournals]

Forthcoming in AER: Insights: "Quantifying Threshold Manipulation in the Presence of Rounding: The Case of Lead Monitoring in U.S. Drinking Water" by Tihitina Andarge, Dalia Ghanem, David A. Keiser, and Gabriel E. Lade. https://t.co/D8OLvq6Tf1

[Eli Fenichel @EliFenichel]

We are hiring in #urban #Sustainability
https://t.co/o4Z3BuRStC -- come join me at Yale

[Review of Environmental Economics and Policy @ReepAere]

🆕 Ahead-of-print in @ReepAere:

"The Evolving Role of Greenhouse Gas Emission Offsets in Combating Climate Change" by Joseph E. Aldy (@josephaldy) and Zachery M. Halem

Read it here: https://t.co/6867mK33cv