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US nonprofit · EIN 680429132 · Nevada City, CAiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 680429132) - NTEE activity code, address.Board and officers IRS Form 990 annual filings, Part VII (directors, trustees, officers, key employees), read year by year to observe time served.Latest return IRS Form 990 series e-file data - 990 for the year to 31 December 2025: assets, liabilities, staff, website, telephone, pay.Finances by year IRS Form 990 e-file data - total revenue and total expenses by tax year.Renewal outlook Computed by Governance Register from the observed filing history and filed revenue. Not a statement that the organisation is recruiting.Deductibility IRS Publication 78 data (code PC), downloaded 18 October 2026.Licence US Federal Government public domain.How we handle data

Sierra Streams Institute

Donations deductible
Revenue
$2.2m
year to 31 December 2025
Expenses
$2.3m
year to 31 December 2025
Total assets
$1.3m
$765k liabilities
Net assets
$572k
assets less liabilities
Directors and trustees
11
5.1 years on average
Staff
22
employees, year to 31 December 2025
Left since last filing
0
no seats appear to have opened
Officers and senior staff
5
named in Part VII
How am I connected?

Sierra Streams Institute's network

11 people2 organisationsi11 people and 2 organisations on this map.The large node is the subject of this page. Solid lines are what the register itself records (11). Violet dotted lines (2) are likely: the same full name sits on the current board of another organisation in the same register and region. Form 990 filings give names without a person identifier; SEC insider filings carry a CIK. It may be a different person.

The board

11 listediTime on the board is observed from the annual filings: the IRS files no appointment date, so the bar counts years from the first filing the person appears on - a lower bound, not a filed start date. Names are exactly as filed. The IRS publishes no person identifier, so this edition does not yet link a person across organisations in the tables. The network map shows same-name matches as likely links only, never as confirmed.Time served and departures are observed across annual filings. Observed time served is a lower bound - a member may have joined before the first year on record. The organisation reported 10 voting members of its governing body on its latest Form 990 Part VI, which matches the board listed here.
NameRole as filedSinceOn the board
Alex PalmDirector2023
3 yrs
Dave HerbstDirector2022
4 yrs
Inge IvensTreasurer2020
6 yrs
Jeff LauderExecutive Dir.2022
4 yrs
Lang WatersPresident2018
8 yrs
Louise Bennicoff Johnson (also filed as Louise Johnson)Company secretary2022
4 yrs
Leslie EstesDirector2023
3 yrs
Lynn BarakosDirector2022
4 yrs
Marsha BurchDirector2023
3 yrs
Poyom RilesDirector2018
8 yrs
Peter HollingsheadDirector2022
4 yrs
Under 5 years5 to 6 years6 years or moreShow all 11 →

Officers and senior leadership

5 listediNamed in Part VII as officers, key employees or highest-compensated staff - not board members, shown for completeness.
NameTitle as filedOn the filings
Chris AlfordCompany secretary2018
Jim PrimroseTreasurersince 2018
Louise Bennicoff JohnsonCompany secretarysince 2019
Nancy FlemingPresidentsince 2018
Nancy KempPresident2019

Pay and hours

year to 31 December 2025iFrom Part VII of the Form 990: compensation reported for each officer, director, trustee, key employee and highest-paid staff member, and the average hours a week they report. Most board members are unpaid; a blank means nothing was reported. Pay from related organisations is shown separately.
NameTitle as filedHours a weekPay from the organisationRelated organisationsOther
Jeffrey LauderExecutive Dir.40$92k
John DuffDirector2$0
Marsha BurchSecretary1$0
Jonathan FarrellDirector2$0
Leslie EstesTreasurer2$0
Inge IvensDirector2$0
Poyom RilesPresident2$0
Lynn BarakosDirector2$0
Alex PalmDirector1$0
Dave HerbstVice President6$0

About

Legal name
Sierra Streams Institute
EIN
680429132
Address
117 New Mohawk Rd Ste H, Nevada City, CA, 95959-3227
State
California
Mission
To promote community stewardship and advance scientific knowledge of watersheds through reserarch, monitoring and education for the benefit of the Sierra Nevada region and beyond. (as filed on the Form 990)
Activity (NTEE)
C123 Environment
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
Environment
Size band
5 (IRS master file code)
Formed
1999
Principal officer
Lang Waters (as named on the Form 990)
IRS ruling date
1 December 1999
Status
Code 01 (unconditional exemption)
Form 990 filings on record
6, latest 2024
IRS Publication 78
PC (contributions deductible)

Most connected

Longest observed on the filings

≥8years on the filingsLang Waters
≥8years on the filingsPoyom Riles
≥6years on the filingsInge Ivens
≥4years on the filingsDave Herbst

Latest return

year to 31 December 2025iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 31 December 2025. US dollars, as filed.
Total assets
$1.3m
Total liabilities
$765k
Net assets or fund balances
$572k
Contributions and grants received
$2m
Program service revenue
$138k
Employees
22

Filed finances

1 yeariTotals as filed on the IRS Form 990 (revenue and expenses), by tax year.
Tax yearTotal revenueTotal expensesSurplus or deficit
2024$2.1m$1.8m$274k

As filed on the IRS Form 990. US dollars.