Impax Asset Management as of Sept. 30, 2012

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ISSUER                           CLASS   CUSIP        	 VALUE    SH/PRN	PUT/  INV         OTHER        VOTING AUTH
                                                        '000s          		CALL  DISCRETION   MGRS    SOLE
Aegion Corp			Common	457667103	 2748	 143400			S		     S
Agilent Technologies		Common	00846U101	 7815	 202800			S		     S
Air Products			Common	009158106	 1323	  15900			S		     S
American Water Works 		Common	030420103	 9030	 243650			S		     S
Aqua America Inc		Common	03826W103	 3550	 143400 		S		     S
Badger Meter			Common	056525108	17082	 469407			S		     S
Calgon Carbon Corp		Common	129603106	 1096     76600			S		     S
Clarcor Inc			Common	179895107	29612	 663507			S		     S
Clean Harbors Inc		Common	184496107	29902	 612114			S		     S
Cree Inc			Common	225447101	 6009	 235590			S		     S
Danaher Corp			Common	235851102	 6669	 120880			S		     S
Donladson Co Inc		Common	257651109	12686	 365500			S		     S
Ecolab Inc			Common	278865100	24475	 376748			S		     S
Emerson Electric Co.		Common	291011104	 5492	 113779			S		     S
Franklin Electric Co Inc	Common	353514102	17940	 296575			S		     S
Hubbell Inc			Common	443510201	 2537	  31300			S		     S
ICF International Inc		Common	44925C103	12595	 626646			S		     S
Idex Corp			Common	45167R104	 8917	 213484 		S		     S
Itron Inc			Common	465741106	34770	 806171			S		     S
Johnson Controls inc		Common	478366107	 5682	 206300			s		     S
LKQ Corp			Common	501889208	28407	1537608			S		     S
Mastec Inc			Common	576323109	 1724	  87500			S		     S
Metalico Inc			Common	591176102	 4490	1754044			S		     S
Ormat Technologies Inc		Common	686688102	17857	 952361			S		     S
Pall Corp			Common	696429307	38985	 614034			S		     S
Pentair Inc.			Common	709631105	33804	 759460			s		     S
Perkinelmer Inc.		Common	714046109	 6549	 222242			S		     S
Power Integrations Inc		Common	739276103	19528	 641318			S		     S
Regal Beloit			Common	758750103	36266	 513461			S		     S
Republic services Inc		Common	760759100	 3853	 139155			S		     S
Rexnord Corp			Common	76169B102	 3519	 193130			S		     S
Roper Industries Inc		Common	776696106	 3184     28975			S		     S
Schnitzer Steel Ind Inc		Common	806882106	 9452    335780			S		     S
Semileds Corp.			Common	816645105	  659	 383150			S		     S
Sims Group			Common	829160100	14955	1510587			S		     S
Stericycle Inc			Common	858912108	23565	 260438			S		     S
Tetra Tech Inc			Common	88162G103	21362	 813507			S		     S
Thermo Fisher Scientific Inc	Common	883556102	 8404	 142563			S		     S
Toro Co				Common	891092108	 1021	  25600			S		     S
Watts Water Technologies-A	Common	942749102	41622	1100245			S		     S
Xylem Inc			Common	98419M100	27787	1104850			S		     S
3M Co				Common	88579Y101	  933     10100			S		     S