Local government investment pools are pooled cash-management vehicles that let cities, counties, school districts, and other public agencies combine idle balances into a single professionally managed short-term portfolio. Roughly $936 billion sits across more than 100 of these pools nationwide. The appeal is practical: a small agency gets access to institutional-grade securities and daily liquidity it could not arrange alone, and in exchange accepts modest yields and a conservative portfolio built to protect principal.
Who Can Join
Participation is limited to government-controlled entities. Counties, cities, towns, and villages use pools to hold tax revenue between collection and disbursement. School districts and community college districts park operating cash and bond proceeds. Water authorities, sewer districts, fire protection districts, and other special-purpose agencies qualify as well.1Municipal Securities Rulemaking Board. LGIP Investment Pool Structure State agencies and instrumentalities of state government round out the participant base.
Each participant keeps its own account inside the pool, so deposits, withdrawals, and interest are tracked separately for every agency. An agency has to document its public-entity status before joining, and most pools require a signed account application on file before honoring any transactions.2Virginia Department of the Treasury. LGIP FAQ
State-Sponsored and Locally Sponsored Pools
Pools come in two forms. State-sponsored pools are created by legislation and usually run out of a state treasurer’s office. They tend to be the larger programs, in part because state backing draws a wider range of participants.
Locally sponsored pools form when two or more governments enter a joint powers agreement. State law generally lets agencies do together anything they could do individually, which is the legal basis for pooling investment activity without state involvement.3Government Finance Officers Association. Local Government Investment Pools These pools operate on whatever terms the member agencies negotiate.
The 2a-7-Like Model
Many pools are built to mirror SEC Rule 2a-7, the federal rule that governs money market mutual funds.4eCFR. 17 CFR 270.2a-7 – Money Market Funds The point is to hold a stable net asset value of one dollar per share so participants can deposit and withdraw at par. Stability is what public treasurers care about most, because budgets assume deposited principal will be there in full when it is needed.
Stable Versus Fluctuating NAV
Not every pool holds a fixed share price. Fluctuating-NAV pools can hold slightly longer-duration or lower-rated instruments and may produce higher yields, but the share price moves with the market and participants accept the possibility of a small principal shift either way. Most public agencies stay with stable-NAV pools because legal restrictions, budget rules, and low tolerance for any principal loss make a fixed share price far more workable.
What the Portfolio Actually Holds
Pool managers stick to short-duration, high-quality instruments that can be turned into cash quickly. A typical portfolio contains:
- U.S. Treasury bills, backed by the full faith and credit of the federal government.
- Federal agency securities issued by entities such as the Federal Home Loan Bank and similar government-sponsored enterprises.1Municipal Securities Rulemaking Board. LGIP Investment Pool Structure
- High-grade commercial paper from top-tier corporate issuers, used for a small yield premium.
- Certificates of deposit at well-capitalized banks.
- Repurchase agreements collateralized by government securities.
Every instrument earns its place by being liquid enough to meet withdrawal demand on any business day. Pools that follow the 2a-7-like model face additional limits on maturity, quality, and diversification that further narrow the eligible list.
Safety, Liquidity, Then Yield
Every well-run pool follows the same priority order: protect principal first, keep enough liquidity to meet withdrawals second, earn a competitive return third. State statutes governing public fund investment typically codify that order, and industry guidance says the same.3Government Finance Officers Association. Local Government Investment Pools
Top-rated pools have historically produced yields competitive with SEC-regulated money market mutual funds. Lower expense ratios help, because pools operate as nonprofit public trusts and more of the gross return reaches participants. The yield edge over a standard government money market fund is usually slim. For smaller agencies the bigger benefit is access. A rural water district with a few hundred thousand dollars in idle cash cannot buy Treasury bills directly on favorable terms, but it can earn a Treasury-like return through a pool.
What Actually Protects the Money
Not SEC-Regulated
LGIPs are not registered with the Securities and Exchange Commission. Section 2(b) of the Investment Company Act of 1940 exempts states, political subdivisions, and their agencies and instrumentalities from the Act’s provisions unless the statute specifically says otherwise.5Office of the Law Revision Counsel. 15 USC 80a-2 Definitions; Applicability; Rulemaking Considerations The exemption spares pools the cost of registration and compliance under the Act. It also means SEC oversight is not the safety net. Protection comes from state statutes, accounting standards, and the pool’s own governance.
GASB Statement 79
The Governmental Accounting Standards Board fills much of that gap through Statement No. 79. The statement sets the criteria an external investment pool must meet to value its holdings at amortized cost rather than marking to market daily.6Governmental Accounting Standards Board. Summary of Statement No. 79 Three requirements matter most:
- A qualifying pool must maintain a dollar-weighted average maturity of 60 days or less, and its holdings must meet specified credit quality and diversification thresholds.
- The pool must regularly calculate a shadow price showing what its shares would be worth at fair market value. That shadow price cannot deviate from the amortized cost NAV by more than half of one percent.
- The pool must transact with participants at a price based on the stable NAV.
Significant noncompliance forces the pool off amortized cost accounting. It then has to report investments at fair value under the older GASB Statement No. 31, which can push unwanted volatility into participants’ books.6Governmental Accounting Standards Board. Summary of Statement No. 79
Principal Stability Ratings
Many pools voluntarily seek a principal stability fund rating from an agency such as S&P Global. The top rating, AAAm, signals an extremely strong capacity to maintain principal stability and limit credit risk exposure. The “m” suffix distinguishes these ratings from traditional bond ratings. Rated pools face weekly portfolio surveillance and an annual management review, and monitoring can step up to daily contact during volatile markets.7S&P Global. Local Government Investment Pools A rating is not a guarantee against loss, but it offers an independent check.
The Risks Worth Understanding
No FDIC Insurance
This catches some participants off guard. Because of how pools are organized, balances held through an LGIP are not eligible for FDIC pass-through insurance.8Federal Deposit Insurance Corporation. PMA Asset Management, LLC – Unsafe and Unsound Banking Practices Protection instead comes from portfolio composition: short-duration, high-quality instruments backed by the U.S. government or top-rated issuers. A well-run pool with a AAAm rating and GASB 79 compliance offers substantial protection, but it is not federal deposit insurance. An agency that specifically needs FDIC coverage on part of its cash should keep separate collateralized bank deposits alongside its pool balance.
What a Run Can Look Like
The most dramatic pool failure in recent memory hit Florida’s State Board of Administration pool in November 2007. The pool held roughly $33 billion from about 1,000 local government participants. When word spread that the portfolio contained approximately $2.1 billion in illiquid commercial paper tied to subprime mortgages, school officials and county clerks pulled billions in a matter of days. Assets fell to $14 billion within weeks, and trustees froze the fund. Managers eventually split it into a liquid portion and a separate fund holding the troubled assets, and participants received their remaining balances on a staggered schedule.
That episode showed how fast confidence can evaporate even in a pool backed by mostly sound investments. It also explains why GASB 79’s portfolio quality and maturity limits exist. A pool that holds only short-duration government-backed securities cannot get caught the way Florida’s did. If you are evaluating a pool, look at what it actually holds, not just its headline yield.
Interest Rate and NAV Risk
Even in a stable-NAV pool, rising interest rates reduce the market value of existing holdings. GASB 79’s shadow price rule acts as a pressure valve. If the gap between market value and amortized cost grows past half a percent, the pool has to switch to fair value reporting, which pushes the paper loss onto participants’ books. The 60-day weighted average maturity limit keeps the risk tightly contained because short-duration instruments reprice quickly, but it does not remove the risk.
Fees, Governance, and the Investment Policy
A board of trustees or advisory committee made up of public officials and finance professionals typically controls a pool. That body approves the investment policy, selects any external managers, and monitors performance. Some pools run entirely on internal staff from a state treasurer’s office; others contract with professional investment firms that specialize in government portfolios.
Management fees are low by industry standards, generally a few basis points to the mid-teens annually. Fees are deducted from portfolio earnings before yield is distributed, so most agencies never see a separate invoice.
Every pool operates under a formal investment policy statement covering permitted instruments, maturity limits, credit quality, diversification, and risk management. The standard order embedded in these policies is safety of principal first, liquidity second, yield third.9Office of the Washington State Treasurer. Local Government Investment Pool A pool’s investment policy is typically public. Any treasurer weighing participation should read it before depositing funds.
Accounting Obligations for Participants
Joining a pool does not remove accounting responsibilities from the participating agency. Under GASB Statement No. 31, a government entity reports its pool investment at fair value on the balance sheet, and all investment income, including changes in fair value, flows through as revenue.10Governmental Accounting Standards Board. Summary of Statement No. 31, Accounting and Financial Reporting for Certain Investments and for External Investment Pools When a pool qualifies under GASB 79’s amortized cost election, participants can measure their investment using the pool’s reported per-share value rather than calculating fair value independently, which simplifies reporting considerably.
Pools are required to disclose limitations or restrictions on participant withdrawals in the notes to their financial statements.6Governmental Accounting Standards Board. Summary of Statement No. 79 Those disclosures let anyone reading a participating agency’s financials assess the credit risk, interest rate risk, and liquidity of the pool without having to hunt down a separate document.