<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e17b4-54a7-77d7-aece-13a9eb33b1a1,g:d60c3a1a-eca3-44f2-b39f-19c8d3e5e5ec-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.energyrecovery.com/role/CoverPage" xlink:type="simple" xlink:href="erii-20260805.xsd#CoverPage"/>
  <link:presentationLink xlink:role="http://www.energyrecovery.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e17b4-54a7-7423-ba3f-db87f947e694" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_DocumentType_019e17b4-54a7-7423-ba3f-db87f947e694" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019e17b4-54a7-7047-86f1-3173dca395a2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_DocumentPeriodEndDate_019e17b4-54a7-7047-86f1-3173dca395a2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e17b4-54a7-73b4-ba37-0fc55d64c174" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_EntityRegistrantName_019e17b4-54a7-73b4-ba37-0fc55d64c174" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019e17b4-54a7-766c-b98f-54d18c13e7e7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019e17b4-54a7-766c-b98f-54d18c13e7e7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019e17b4-54a7-7725-84a2-6a08787b2916" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_EntityFileNumber_019e17b4-54a7-7725-84a2-6a08787b2916" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e17b4-54a7-7271-bbb5-5bb7344b810f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e17b4-54a7-7271-bbb5-5bb7344b810f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019e17b4-54a7-7d76-8b4b-9a1e8aff40c3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_EntityAddressAddressLine1_019e17b4-54a7-7d76-8b4b-9a1e8aff40c3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019e17b4-54a7-7b91-ab0e-f2a5a3ee7913" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_EntityAddressCityOrTown_019e17b4-54a7-7b91-ab0e-f2a5a3ee7913" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019e17b4-54a7-75dd-abf7-c19b5854cc95" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_EntityAddressStateOrProvince_019e17b4-54a7-75dd-abf7-c19b5854cc95" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019e17b4-54a7-7c3e-bdc8-faf3028f4c56" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_EntityAddressPostalZipCode_019e17b4-54a7-7c3e-bdc8-faf3028f4c56" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019e17b4-54a7-793b-9332-35fac8f51ad4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_CityAreaCode_019e17b4-54a7-793b-9332-35fac8f51ad4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019e17b4-54a7-760b-8e59-a406810f3852" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_LocalPhoneNumber_019e17b4-54a7-760b-8e59-a406810f3852" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019e17b4-54a7-7cc5-af15-21e1ca63fd43" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_WrittenCommunications_019e17b4-54a7-7cc5-af15-21e1ca63fd43" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019e17b4-54a7-7ea4-8461-8b1f235ee978" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_SolicitingMaterial_019e17b4-54a7-7ea4-8461-8b1f235ee978" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019e17b4-54a7-70bb-8519-6d5a57976a2c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_PreCommencementTenderOffer_019e17b4-54a7-70bb-8519-6d5a57976a2c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019e17b4-54a7-725e-a745-9e1a31115178" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019e17b4-54a7-725e-a745-9e1a31115178" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019e17b4-54a7-70f5-a900-583c7708e3ee" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_Security12bTitle_019e17b4-54a7-70f5-a900-583c7708e3ee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019e17b4-54a7-7fd4-93fb-4ebad16655e8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_TradingSymbol_019e17b4-54a7-7fd4-93fb-4ebad16655e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019e17b4-54a7-788a-8451-fa9a0fd968aa" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_SecurityExchangeName_019e17b4-54a7-788a-8451-fa9a0fd968aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019e17b4-54a7-7986-ab02-7e71c78647b6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_EntityEmergingGrowthCompany_019e17b4-54a7-7986-ab02-7e71c78647b6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e17b4-54a7-7223-9050-6749a57755f8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_EntityCentralIndexKey_019e17b4-54a7-7223-9050-6749a57755f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e17b4-54a7-7502-ad25-a25812d7a04d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e17b4-54a7-7153-b5e3-c18549598caf" xlink:to="loc_dei_AmendmentFlag_019e17b4-54a7-7502-ad25-a25812d7a04d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
