Sectors & Industries IndustrialsPollution & Treatment Controls
Best Pollution & Treatment Control Stocks to Buy Now (2025)
Top pollution & treatment control stocks in 2025 ranked by overall Zen Rating. "A" Rated stocks have returned an average of +32.52% per year, and are the best pollution & treatment control stocks to buy now. Learn More.

Industry: Pollution & Treatment Con...

Growth Financials Momentum Sentiment Forecast Dividends Due Diligence

Pollution & Treatment Controls is Zen Rated C and is the 68th ranked industry out of 145 stock market industries

Ticker	Company	Price	Graham Fair Value	Graham Fair Value %	P/E	Forward P/E	P/S	P/B	PEG	Free Cash Flow	Free Cash Flow Yield	Book Value	BVPS	EV	EV/EBITDA
ERII	ENERGY RECOVERY INC	$15.58	$8.90	75.03%	38.95x	24.73x	6.15x	4.08x	0.84x	$19.36M	2.17%	$210.01M	3.67	$826.58M	26.19
ZWS	ZURN ELKAY WATER SOLUTIONS CORP	$34.43	$12.03	186.27%	34.78x	25.43x	3.71x	3.74x	1.90x	$260.10M	4.44%	$1.55B	9.09	$6.19B	17.96
FSS	FEDERAL SIGNAL CORP	$84.24	$33.23	153.51%	24.35x	22.36x	2.71x	4.27x	2.18x	$198.90M	3.86%	$1.20B	19.68	$5.38B	15.13
VLTO	VERALTO CORP	$94.21	$27.55	241.92%	26.61x	25.72x	4.42x	10.14x	4.37x	$860.00M	3.68%	$2.30B	9.29	$24.74B	18.84
CECO	CECO ENVIRONMENTAL CORP	$24.41	N/A	N/A	17.95x	20.40x	1.41x	3.01x	N/A	-$5.73M	-0.67%	$285.79M	8.16	$1.07B	10.68
ATMU	ATMUS FILTRATION TECHNOLOGIES INC	$35.26	$19.23	83.35%	15.81x	14.32x	1.76x	12.85x	1.87x	$56.80M	1.94%	$227.40M	2.73	$3.33B	11.09
ARQ	ARQ INC	$3.81	N/A	N/A	-27.21x	29.31x	1.26x	0.74x	N/A	-$74.72M	-54.41%	$217.28M	6.03	$171.38M	26.05
ADUR	ADURO CLEAN TECHNOLOGIES INC	$5.17	N/A	N/A	N/A	N/A	N/A	16.93x	N/A	N/A	N/A	$8.83M	0.31	$143.74M	N/A
PCT	PURECYCLE TECHNOLOGIES INC	$6.66	N/A	N/A	-3.81x	-8.36x	N/A	6.62x	N/A	-$200.41M	-18.20%	$180.45M	1.09	$1.56B	-7.91
ZONE	CLEANCORE SOLUTIONS INC	$1.33	N/A	N/A	-2.77x	N/A	6.62x	5.04x	N/A	-$2.99M	-27.59%	$2.21M	0.27	$13.60M	-4.64
DEVS	DEVVSTREAM CORP	$0.22	N/A	N/A	N/A	N/A	N/A	-0.34x	N/A	N/A	N/A	-$19.35M	-0.72	$10.45M	N/A
CLWT	EURO TECH HOLDINGS CO LTD	$1.14	$0.56	103.39%	11.40x	N/A	0.57x	0.56x	N/A	$776.00k	8.86%	$15.74M	2.04	$1.81M	1.90
CHNR	CHINA NATURAL RESOURCES INC	$0.56	N/A	N/A	-2.43x	N/A	N/A	0.53x	N/A	$1.84M	32.98%	$10.51M	1.07	$4.96M	-3.32
LIQT	LIQTECH INTERNATIONAL INC	$1.50	N/A	N/A	-0.91x	-2.49x	0.65x	0.86x	N/A	-$7.96M	-84.35%	$16.65M	2.64	$15.31M	-2.05
FTEK	FUEL TECH INC	$0.97	N/A	N/A	-16.17x	-19.40x	1.18x	0.71x	N/A	-$3.81M	-12.89%	$41.96M	1.37	$21.90M	-15.58
TOMZ	TOMI ENVIRONMENTAL SOLUTIONS INC	$0.80	N/A	N/A	-3.64x	-6.15x	2.07x	3.91x	N/A	-$1.55M	-9.63%	$4.10M	0.21	$18.35M	-5.05
SCWO	374WATER INC	$0.31	N/A	N/A	-3.40x	N/A	102.00x	2.86x	N/A	-$11.14M	-27.12%	$15.47M	0.12	$34.24M	-2.81
CLIR	CLEARSIGN TECHNOLOGIES CORP	$0.57	N/A	N/A	-5.16x	-4.37x	7.78x	2.16x	N/A	-$4.41M	-15.85%	$13.76M	0.28	$15.93M	-3.17

Pollution & Treatment Control Stocks FAQ

What are the best pollution & treatment control stocks to buy right now in May 2025?

According to Zen Ratings, our proprietary rating system that evaluates 115 factors proven to drive growth in stocks and assigns each stock in our system an overall letter grade as well as 7 individual Component Grades for Value, Growth, Momentum, Sentiment, Safety, Financials, and proprietary AI algorithms, the 3 best pollution & treatment control stocks to buy right now are:

1. Energy Recovery (NASDAQ:ERII)

Energy Recovery (NASDAQ:ERII) is the #1 top pollution & treatment control stock out of 18 with a Zen Rating of B. Stocks with a rating of B have had an average return of +19.88% per year. Learn more.

The Component Grade breakdown for Energy Recovery (NASDAQ:ERII) is: Value: C, Growth: C, Momentum: C, Sentiment: C, Safety: D, Financials: A, and AI: B.

Energy Recovery (NASDAQ:ERII) has a Due Diligence Score of 55, which is 25 points higher than the pollution & treatment control industry average of 30.

ERII passed 18 out of 33 due diligence checks and has strong fundamentals. Energy Recovery has seen its stock return 6.35% over the past year, overperforming other pollution & treatment control stocks by 7 percentage points.

Energy Recovery has an average 1 year price target of $20.67, an upside of 32.65% from Energy Recovery's current stock price of $15.58.

Energy Recovery stock has a consensus Strong Buy recommendation according to Wall Street analysts. Of the 3 analysts covering Energy Recovery, 66.67% have issued a Strong Buy rating, 33.33% have issued a Buy, 0% have issued a hold, while 0% have issued a Sell rating, and 0% have issued a Strong Sell.

2. Zurn Elkay Water Solutions (NYSE:ZWS)

Zurn Elkay Water Solutions (NYSE:ZWS) is the #2 top pollution & treatment control stock out of 18 with a Zen Rating of C. Stocks with a rating of C have had an average return of +7.53% per year. Learn more.

The Component Grade breakdown for Zurn Elkay Water Solutions (NYSE:ZWS) is: Value: C, Growth: C, Momentum: C, Sentiment: C, Safety: B, Financials: B, and AI: C.

Zurn Elkay Water Solutions (NYSE:ZWS) has a Due Diligence Score of 38, which is 8 points higher than the pollution & treatment control industry average of 30.

ZWS passed 14 out of 38 due diligence checks and has average fundamentals. Zurn Elkay Water Solutions has seen its stock return 9.86% over the past year, overperforming other pollution & treatment control stocks by 11 percentage points.

Zurn Elkay Water Solutions has an average 1 year price target of $37.33, an upside of 8.43% from Zurn Elkay Water Solutions's current stock price of $34.43.

Zurn Elkay Water Solutions stock has a consensus Buy recommendation according to Wall Street analysts. Of the 3 analysts covering Zurn Elkay Water Solutions, 33.33% have issued a Strong Buy rating, 0% have issued a Buy, 66.67% have issued a hold, while 0% have issued a Sell rating, and 0% have issued a Strong Sell.

3. Federal Signal (NYSE:FSS)

Federal Signal (NYSE:FSS) is the #3 top pollution & treatment control stock out of 18 with a Zen Rating of C. Stocks with a rating of C have had an average return of +7.53% per year. Learn more.

The Component Grade breakdown for Federal Signal (NYSE:FSS) is: Value: C, Growth: C, Momentum: C, Sentiment: C, Safety: B, Financials: A, and AI: B.

Federal Signal (NYSE:FSS) has a Due Diligence Score of 54, which is 24 points higher than the pollution & treatment control industry average of 30.

FSS passed 20 out of 38 due diligence checks and has strong fundamentals. Federal Signal has seen its stock return 4.85% over the past year, overperforming other pollution & treatment control stocks by 6 percentage points.

Federal Signal has an average 1 year price target of $95.00, an upside of 12.77% from Federal Signal's current stock price of $84.24.

Federal Signal stock has a consensus Buy recommendation according to Wall Street analysts. Of the 2 analysts covering Federal Signal, 0% have issued a Strong Buy rating, 50% have issued a Buy, 50% have issued a hold, while 0% have issued a Sell rating, and 0% have issued a Strong Sell.

What are the pollution & treatment control stocks with highest dividends?

Out of 5 pollution & treatment control stocks that have issued dividends in the past year, the 3 pollution & treatment control stocks with the highest dividend yields are:

1. Euro Tech Holdings Co (NASDAQ:CLWT)

Euro Tech Holdings Co (NASDAQ:CLWT) has an annual dividend yield of 7.02%, which is 5 percentage points higher than the pollution & treatment control industry average of 1.77%.

Euro Tech Holdings Co's dividend payout ratio of 80% indicates that its high dividend yield is sustainable for the long-term.

2. Zurn Elkay Water Solutions (NYSE:ZWS)

Zurn Elkay Water Solutions (NYSE:ZWS) has an annual dividend yield of 0.99%, which is -1 percentage points lower than the pollution & treatment control industry average of 1.77%. Zurn Elkay Water Solutions's dividend payout is not stable, having dropped more than 10% one times in the last 10 years. Zurn Elkay Water Solutions's dividend has shown consistent growth over the last 10 years.

Zurn Elkay Water Solutions's dividend payout ratio of 34.3% indicates that its dividend yield is sustainable for the long-term.

3. Federal Signal (NYSE:FSS)

Federal Signal (NYSE:FSS) has an annual dividend yield of 0.59%, which is -1 percentage points lower than the pollution & treatment control industry average of 1.77%. Federal Signal's dividend payout is stable, having never dropped by more than 10% in the last 10 years. Federal Signal's dividend has shown consistent growth over the last 10 years.

Federal Signal's dividend payout ratio of 14.5% indicates that its dividend yield is sustainable for the long-term.

Why are pollution & treatment control stocks up?

Pollution & treatment control stocks were up 0.85% in the last day, and up 5.99% over the last week.

We couldn't find a catalyst for why pollution & treatment control stocks are up.

What are the most undervalued pollution & treatment control stocks?

Based on the Valuation rating, one of the 7 components of a stocks overall Zen Ratings grade, which evaluates factors including estimated earnings yield, earnings before interest and taxes/enterprise value, cash flow yield, free cash flow to price, and price-to-earnings growth (PEG ratio), the 3 most undervalued pollution & treatment control stocks right now are:

1. Atmus Filtration Technologies (NYSE:ATMU)

Atmus Filtration Technologies (NYSE:ATMU) is the most undervalued pollution & treatment control stock based on its Valuation Rating of C. Valuation is one of 7 Component Grades used to calculate the overall Zen Rating.

Atmus Filtration Technologies has a valuation score of 29, which is 9 points higher than the pollution & treatment control industry average of 20. It passed 2 out of 7 valuation due diligence checks.

Atmus Filtration Technologies's stock has gained 16.87% in the past year. It has overperformed other stocks in the pollution & treatment control industry by 18 percentage points.

2. Ceco Environmental (NASDAQ:CECO)

Ceco Environmental (NASDAQ:CECO) is the second most undervalued pollution & treatment control stock based on its Valuation Rating of C. Valuation is one of 7 Component Grades used to calculate the overall Zen Rating.

Ceco Environmental has a valuation score of 43, which is 23 points higher than the pollution & treatment control industry average of 20. It passed 3 out of 7 valuation due diligence checks.

Ceco Environmental's stock has gained 10.95% in the past year. It has overperformed other stocks in the pollution & treatment control industry by 12 percentage points.

3. Zurn Elkay Water Solutions (NYSE:ZWS)

Zurn Elkay Water Solutions (NYSE:ZWS) is the third most undervalued pollution & treatment control stock based on its Valuation Rating of C. Valuation is one of 7 Component Grades used to calculate the overall Zen Rating.

Zurn Elkay Water Solutions has a valuation score of 14, which is -6 points higher than the pollution & treatment control industry average of 20. It passed 1 out of 7 valuation due diligence checks.

Zurn Elkay Water Solutions's stock has gained 9.86% in the past year. It has overperformed other stocks in the pollution & treatment control industry by 11 percentage points.

Are pollution & treatment control stocks a good buy now?

69.23% of pollution & treatment control stocks rated by analysts are a buy right now. On average, analysts expect pollution & treatment control stocks to rise by 38.69% over the next year.

0% of pollution & treatment control stocks have a Zen Rating of A (Strong Buy), 11.11% of pollution & treatment control stocks are rated B (Buy), 55.56% are rated C (Hold), 0% are rated D (Sell), and 33.33% are rated F (Strong Sell).

What is the average p/e ratio of the pollution & treatment controls industry?

The average P/E ratio of the pollution & treatment controls industry is 25.46x.

WallStreetZen does not provide financial advice and does not issue recommendations or offers to buy stock or sell any security.

Information is provided 'as-is' and solely for informational purposes and is not advice. WallStreetZen does not bear any responsibility for any losses or damage that may occur as a result of reliance on this data.

Pollution & Treatment Control Stocks FAQ

1. Energy Recovery (NASDAQ:ERII)

2. Zurn Elkay Water Solutions (NYSE:ZWS)

3. Federal Signal (NYSE:FSS)

1. Euro Tech Holdings Co (NASDAQ:CLWT)

2. Zurn Elkay Water Solutions (NYSE:ZWS)

3. Federal Signal (NYSE:FSS)

1. Atmus Filtration Technologies (NYSE:ATMU)

2. Ceco Environmental (NASDAQ:CECO)

3. Zurn Elkay Water Solutions (NYSE:ZWS)

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