Interstate Commission on the Potomac River Basin: Single Audit Reports and Findings
Interstate Commission on the Potomac River Basin filed 10 single audits between 2016 and 2025; the most recently observed auditor is CLIFTONLARSONALLEN LLP (2025), and the 2025 report lists 1 finding. Data as of 2026-11-06.
Data as of Nov 6, 2026 · Source: Federal Audit Clearinghouse (public data)
Single audits by year
One row per audit year as the Federal Audit Clearinghouse accepted it. The auditor named is the one observed on that filing; Interstate Commission on the Potomac River Basin is recorded in ROCKVILLE, Maryland under EIN 536001427, and the Clearinghouse records it as a local government. Each report opens on the Clearinghouse itself; how to search the Federal Audit Clearinghouse explains the rest of the reporting package.
| Audit year | Fiscal year end | Federal expended | Threshold applied | Auditor observed | Findings | MW / SD | FAC report |
|---|---|---|---|---|---|---|---|
| 2025 | 2025-09-30 | $1,019,269 | $1,000,000 | CLIFTONLARSONALLEN LLP | 1 | SD | 2025-09-GSAFAC-0000416167 |
| 2024 | 2024-09-30 | $988,580 | $750,000 | CLIFTONLARSONALLEN LLP | 0 | — | 2024-09-GSAFAC-0000369093 |
| 2023 | 2023-09-30 | $909,214 | $750,000 | CLIFTONLARSONALLEN LLP | 0 | — | 2023-09-GSAFAC-0000043933 |
| 2022 | 2022-09-30 | $971,968 | $750,000 | CLIFTONLARSONALLEN LLP | 1 | SD | 2022-09-CENSUS-0000181626 |
| 2021 | 2021-09-30 | $953,471 | $750,000 | CLIFTONLARSONALLEN LLP | 0 | — | 2021-09-CENSUS-0000181626 |
| 2020 | 2020-09-30 | $891,136 | $750,000 | CLIFTONLARSONALLEN LLP | 0 | — | 2020-09-CENSUS-0000181626 |
| 2019 | 2019-09-30 | $830,335 | $750,000 | CLIFTONLARSONALLEN LLP | 0 | — | 2019-09-CENSUS-0000181626 |
| 2018 | 2018-09-30 | $859,730 | $750,000 | CLIFTONLARSONALLEN LLP | 0 | — | 2018-09-CENSUS-0000181626 |
| 2017 | 2017-09-30 | $814,598 | $750,000 | CLIFTONLARSONALLEN LLP | 0 | — | 2017-09-CENSUS-0000181626 |
| 2016 | 2016-09-30 | $1,170,420 | $750,000 | CLIFTONLARSONALLEN LLP | 0 | — | 2016-09-CENSUS-0000181626 |
When is the next single audit due?
If Interstate Commission on the Potomac River Basin is again required to have a single audit for the fiscal year ending Sep 30, 2026, the reporting package is due to the Federal Audit Clearinghouse by Jun 30, 2027 at the latest.
Whether an audit is required depends on federal awards expended in that year (the single audit threshold). The rule, 2 CFR 200.512(a): the reporting package is due within 30 calendar days after the auditee receives the auditor's report or nine months after the end of the audit period, whichever is earlier; the date above is the nine-month date, moved to Monday when it falls on a weekend. Last verified: 2026-11-15.
Which federal programs did this organization report?
From the most recent accepted report, as listed on its schedule of expenditures of federal awards (SEFA). "Major" is the designation the auditor made under 2 CFR 200.518, not ours.
| ALN | Program | Expended | Major |
|---|---|---|---|
| 66.419 | WATER POLLUTION CONTROL STATE, INTERSTATE, AND TRIBAL PROGRAM SUPPORT | $634,000 | Yes |
| 66.466 | GEOGRAPHIC PROGRAMS - CHESAPEAKE BAY PROGRAM | $293,789 | No |
| 66.454 | WATER QUALITY MANAGEMENT PLANNING | $57,316 | No |
| 66.468 | DRINKING WATER STATE REVOLVING FUND | $8,888 | No |
| 66.468 | DRINKING WATER STATE REVOLVING FUND | $8,888 | No |
| 66.468 | DRINKING WATER STATE REVOLVING FUND | $8,888 | No |
| 15.670 | ADAPTIVE SCIENCE | $7,500 | No |
What findings did the auditor report?
The reference is the auditor’s; the requirement is the Compliance Supplement category the auditor selected. The finding text itself is not reproduced here; the FAC report linked above carries it in full. What the two severity levels mean: material weakness vs significant deficiency.
| Reference | Requirement | Severity | Repeat |
|---|---|---|---|
| 2025-001 | Procurement and suspension and debarment (I) | Significant deficiency / Questioned costs | No |
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How we computed this
Every row comes from the Federal Audit Clearinghouse record named beside it, one report per audit year, with a resubmission superseding the filing it replaces. The auditor is the one named on that filing — it is not a statement about who audits Interstate Commission on the Potomac River Basin now. Form 990 figures come from the IRS e-filed return named by its object id. This page exists because the organization filed at least two single audits, or one with a finding.
Cite this page
AuditRadar. “Interstate Commission on the Potomac River Single Audits (MD).” https://getauditradar.com/single-audits/md/interstate-commission-on-the-potomac-river-basin-536001427/. Data as of 2026-11-06.