Is it time to Buy Water?
What Data Center Demand Reveals About Water Businesses That Can Compound for Decades
Why Water Businesses: Why Data Centers Matter Now
AI and cloud infrastructure have made one constraint obvious: compute is no longer the bottleneck. Inputs are.
Every modern data center requires three things to scale:
Power
Cooling
Water
While markets obsess over GPUs, power grids, and semiconductors, water has quietly become a binding constraint on data-center expansion. Hyperscale facilities consume millions of gallons of water per day for cooling, treatment, recycling, and discharge compliance. In water-stressed regions, data-center permits are now being delayed or denied specifically because of water availability and treatment capacity.
This is not cyclical demand.
It is structural, non-optional, and regulation-enforced.
Once a data center is built, water usage is not discretionary:
Cooling systems must run continuously
Water must be treated to precise specifications
Wastewater must meet tightening environmental standards
Recycling and reuse systems are increasingly mandated
That creates a rare demand profile:
Long-duration
High switching costs
Mission-critical
Price-inelastic
In other words, perfect conditions for compounding businesses! If capital is allocated correctly.
But not all water companies benefit equally.
Some operate as regulated utilities, where returns are capped and growth requires constant equity issuance. Others sell mission-critical water treatment, monitoring, and optimization services into data centers and industrial systems — where pricing power, recurring revenue, and embedded relationships matter far more than rate cases.
That distinction is what this analysis is designed to surface.
So instead of asking:
“Which water stocks look cheap?”
I asked the only question that matters for long-term capital:
If I owned these businesses outright for the next 10 years, which would quietly compound value — and which would slowly leak it?
The analysis below comes directly from the earnings calls. It’s stripped of narrative, filtered through capital allocation, and judged by whether each business is becoming harder or easier to replace as data-center demand accelerates. It’s the same long-term lens Warren Buffett and Charlie Munger have used for decades. Enjoy.
If I Owned These Water Businesses for 10 Years
A Permanent-Capital Earnings Review (Buffett × Munger Lens)
Most earnings call analysis focuses on what management said.
Permanent-capital analysis focuses on what actually changed and whether capital is being allocated in a way that compounds value over decades.
So I ran the latest earnings calls of the major water stocks through one question:
If I owned this business outright for the next 10 years, what from this call would most increase or decrease my conviction — and why?
This forces the two things Buffett obsesses over:
Business quality
Capital discipline
Below is how the answers stacked up.
Ranking: Best to Weakest (Permanent-Capital View)
1. Ecolab ECL 0.00%↑ — The Clear Winner
What truly changed (not repeated):
Operating margin reached a record 18.7%, up 110 bps, with a clear path to 20%+ by 2027
Digital revenue accelerated 25% to $96M, shifting the model toward recurring subscriptions
Announced the $1.8B Ovivo acquisition, positioning Ecolab at the center of data-center and microelectronics water treatment
Pricing power (real evidence):
Gross margin expanded 130 bps to 44.8% despite input cost pressure
Customer retention remained in the 90%+ range
Results driven by “value pricing,” not just cost cutting
Capital allocation:
Disciplined M&A targeting secular growth
$375M in buybacks + $565M in dividends
Net debt / EBITDA held at a conservative 1.7x
Why conviction rises over 10 years:
This is the holy grail:
Customers stay, prices rise, margins expand → all at once.
The digital shift matters even more. Ecolab is transitioning from selling chemicals to selling outcomes via software. Software margins approach zero marginal cost. If digital revenue compounds at ~20% for a decade, today’s $96M quietly becomes an ~$800–900M, ultra-high-margin stream layered on top of an already sticky base business.
Add in the data-center water bottleneck, and Ecolab looks less like a chemical company → and more like a quiet infrastructure compounder.
Conviction: MASSIVELY higher
2. Xylem XYL 0.00%↑ — Capital Discipline in Action
What truly changed:
Divesting international metering to focus on high-return North American AMI
EBITDA margin hit 23.2%, up ~200 bps
China operations restructured with a 40% workforce reduction
Pricing power:
Gross margin up 160 bps
Tariffs offset via pricing and supply-chain optimization
Double-digit growth in higher-value segments
Capital allocation:
Willingness to exit weaker businesses instead of subsidizing them
Net debt / EBITDA just 0.4x with $2.2B in liquidity
Targeted tuck-in acquisitions only
Why conviction rises over 10 years:
This is management behavior Buffett loves:
Put underperforming assets in the “too hard” pile and move on.
Even more telling: China weakness wasn’t hand-waved, it was acted on.
With a fortress balance sheet and a focus on smart water infrastructure, Xylem has the optionality to deploy capital when others can’t.
Conviction: STRONGLY higher
3. Pentair PNR 0.00%↑ — Operationally Strong, Strategically Fragile
What truly changed:
Transformation savings hitting $80M
Return on sales expanded to 25.7%
Hydra-Stop acquisition strengthened Flow segment economics
Pricing power:
Margins expanded sharply across segments
Prices raised to offset ~$75M in tariffs
The concern:
Water Solutions revenue declined 5–6%, while margins expanded nearly 300 bps.
That’s a classic sign of cutting to prosperity. It works temporarily — not for a decade.
Why conviction wobbles:
If capital continues flowing into a shrinking segment, long-term compounding math breaks. The real question is whether management reallocates capital away from Water Solutions toward Pool and Flow — or props up decline.
Conviction: CONDITIONAL
4. American Water Works AWK 0.00%↑ — Defensive, But a Capital Treadmill
What truly changed:
Announced a massive $29B capital plan
Growth funded via operating cash flow plus debt plus equity issuance
The permanent-capital problem:
Dividend payout of ~55–60%
Simultaneous equity issuance ($2.5B planned + equity forwards already used)
This is a value-leakage loop:
Pay dividends → issue shares → pay underwriting costs → dilute owners.
Why conviction falls over 10 years:
You’re receiving cash with one hand while giving ownership back with the other. That’s fine for income portfolios → not for per-share compounding.
Conviction: LOWER
5. Essential Utilities WTRG 0.00%↑ — Same Problem, Less Flexibility
What truly changed:
Equity issuance accelerating
Merger with American Water defines future returns
Why conviction drops further:
Heavy reliance on equity markets
High payout ratio
Shareholders effectively outsource capital allocation to a larger utility with the same structural issues
Conviction: LOWER
6. Veolia $VEOEY — Too Complex to Compound Cleanly
What truly changed:
€2.3B in acquisitions
Leverage hovering near 3.0x
Red flag:
EBITDA grew, but free cash flow did not.
That means growth is being consumed by reinvestment just to stand still. Add 80% international exposure, FX risk, and ongoing integration, and capital allocation becomes fragmented and opaque.
Conviction: LOWER
Final Takeaway: The Buffett × Munger Answer
Conviction increases dramatically:
Ecolab ECL 0.00%↑
Xylem XYL 0.00%↑
These businesses:
Earn high returns on incremental capital
Reinvest intelligently
Are getting harder to compete with over time
Conviction decreases:
American Water
Essential Utilities
Veolia
These businesses:
Require continuous external capital
Dilute shareholders or consume cash internally
Cap upside through structure or complexity
Conviction wobbles:
Pentair — execution is strong, capital allocation must follow
Why this framework matters
Markets reward stories in the short term.
Wealth is built by owning businesses that quietly compound per-share value for decades.
That’s the only lens that matters when permanent capital is at risk.