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Mattatuck Historical Society

Waterbury, Connecticut · EIN 06-0443990 · Arts, Culture & Humanities · tax-exempt since 1938

C

Charity Clarity grade C (score 57.7 of 100), based on the Form 990 for the year ended September 2025.

Graded against 19,395 arts, culture & humanities nonprofits with revenue $2M–$10M filing the same form. A = top 10%, B = next 20%, C = middle 40%, D = next 20%, F = bottom 10%.

What goes into the grade

MeasureThis charityScore (0–100)
ReservesMonths of spending covered by unrestricted net assets.96.1 months0
GovernanceBoard independence, key policies and audit, per the 990.100% of practices100
Margin stabilityHow steady the surplus or deficit is year to year.40
Revenue spreadHow much revenue rests on one type of income.37% from one source77
Filing recordOn-time, complete filings, year after year.100%100
Program spendingSelf-reported by the filer.91.0%not scored
Management costsShare of spending.1.0%not scored
Cost to raise $1Fundraising cost per dollar given.$0.18not scored

Scores compare this charity with its peer group; 100 is best. How Charity Clarity rates charities.

Year by year

201620172018201920202021202220242025grey: revenue · green: spending
Year endedFormRevenueSpendingSurplusNet assetsMonths of spendingStaffGrade
Sep 2025Form 990$3.55M$3.47M$79K$27.75M96.139C
Sep 2024Form 990$2.75M$3.25M−$507K$27.90M102.933C
Sep 2022Form 990$3.50M$2.86M$638K$26.76M112.331C
Sep 2021Form 990$3.19M$2.97M$222K$29.67M119.824C
Sep 2020Form 990$4.72M$2.22M$2.50M$28.12M152.123C
Sep 2019Form 990$3.26M$2.30M$958K$25.04M130.530C
Sep 2018Form 990$3.59M$2.94M$645K$24.60M100.430C
Sep 2017Form 990$2.74M$2.42M$321K$23.01M114.126C
Sep 2016Form 990$1.81M$2.10M−$287K$21.57M123.326C

From the organisation’s own IRS filings. “Months of spending” is total net assets divided by a month of that year’s spending. A blank grade means that year was not rated.

Read the filings

Every figure here comes from the returns this charity filed with the IRS. These sites show the full returns and more about the organisation:

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