MWA — Mueller Water Products, Inc.

Mueller Water Products (NYSE: MWA) — deep-value analysis

August 22, 2026 · reference price … (yfinance, close 08/21/2026) · market cap … · 156.1 mil. shares outstanding / 157.3 mil. diluted · fiscal year ended September 30

Primary sources: 10-K FY2025 (filed 11/19/2025), 10-Q Q3 FY2026 (filed 08/06/2026, period ended 06/30/2026), 8-K/Ex-99.1 of 08/05/2026, DEF 14A of 12/19/2025, Form 4s from 2026, plus the data pack data-pack-MWA-20260822.md and the research brief research-MWA-20260822.md. FY2026 quarterly figures were NOT in the auto-downloaded SEC file set (it stopped at the calendar-2025 10-Qs); I separately downloaded the 08/06/2026 10-Q from EDGAR and all FY2026 figures below come from it.

Executive summary

Mueller Water Products is exactly the kind of business Buffett would want to own and exactly the kind of price he wouldn’t buy it at. The company makes fire hydrants, cast-iron valves and repair products for North American water networks, has one of the largest installed bases in the United States, its products are nominally specified in the engineering codes of the top 100 American metro areas (10-K FY2025, Item 1), and the main competitors on key segments — McWane and American Cast Iron Pipe — are private companies, so they don’t fight over quarterly market share. Return on invested capital is 20.2% after tax (TTM EBIT 287.3 mil. × 0.76 / invested capital 1,078.0 mil.), TTM gross margin 37.9%, the balance sheet is net cash of …, and the only debt is a … issuance with a 4.0% coupon due June 2029, with no financial maintenance covenants. There’s no business-quality problem here.

There’s a price problem and a profit-composition problem. At … the stock trades at 17.7x TTM profit, at 10.4x FY2026-estimated adjusted EBITDA, and at a free-cash-flow yield of 4.6% — for a company growing sales 2.8… (its own guidance, revised 08/05/2026). My discounted-flow model, starting from … of normalized owner earnings and 5% growth in the first five years at a 9% discount rate, gives an intrinsic value of …/share — …% below the market. Monte Carlo across 20,000 scenarios (mc_dcf.py, same assumptions, dispersions OE ±25%, g1 σ=3pp, r σ=1pp) gives a median intrinsic value of … and only a …% probability of undervaluation. The full triangulation (five models) gives a range from … to … margin of safety, with a median of ….

The second problem is more subtle and is why I don’t treat the record August quarter as an inflection point. Of the … increase in operating profit between FY2024 and FY2025, … (46%) comes from two accounting items unrelated to operations: the non-repeat of the … goodwill impairment from 2024 and intangibles amortization collapsing from … to … (10-K FY2025, cash flow statement). In Q3 FY2026, of the … adjusted EPS, … is a one-time tax benefit from recognizing a loss on a foreign subsidiary investment (explicitly stated in the release) and about … is tariff refunds that management itself calls “non-recurring” — so 18% of the record quarter is non-repeating, and the … beat over the … consensus is practically fully explained by these two items.

The third problem is on the balance sheet and is the biggest: inventory. Days of inventory rose from 89.6 (FY2021) to 150.8 (TTM) — 61 extra days, about … of cash tied up at the current cost-of-goods-sold rate. In the last nine months alone, finished goods grew from … to … (…) while sales grew 4.7%, and the inventory-impairment provision tripled, from … to … The segment building inventory — Water Flow Solutions, … — is exactly the segment with flat sales (… vs. … over nine months). The company’s precedent isn’t encouraging: in FY2022, MWA had another … inventory buildup that reduced operating flow to … — and inventory never returned to its prior level.

Verdict: AVOID at the current price. High-quality company, price with no margin of safety. Estimated intrinsic value …-22/share in the central scenario (MC median …), with a triangulated range of …-30.80. The entry point with a 25% margin of safety versus the central value would be below …; a reasonable entry point accepting a 15% margin would be around …-17.5. The GBL tracker gives 18.25/30 and “correction candidate below …-18” — near-perfect convergence with my model, reached by different paths. Signal to watch at the Q4 FY2026 report (early November 2026): finished goods. If they stay above … with flat sales, the earnings-quality thesis degrades a notch.