Every state has its own water, its own weather, and its own ways that windows fail. These are the long-form pages where one of our contributors walks through how cleaning actually works on the ground in their region.
The corridor from Boston to Philadelphia plus the six New England states. Heritage residential stock here is among the deepest in the country.
Connecticut splits into three chemistry zones along Gold Coast / Central Valley / Eastern boundaries. Fairfield County and the Gold Coast run Aquarion Water Company surface-source at 60-110 mg/L. The central Connecticut River valley runs MDC at 70-130 mg/L. Eastern Connecticut runs a patchwork of smaller municipal systems plus substantial private well supply that runs harder at 130-220 mg/L. The shoreline carries Long Island Sound salt-aerosol exposure.
Maine runs as five working zones. Portland and the southern coastal corridor at 80-160 mg/L on Portland Water District Sebago Lake-source surface supply (among the cleaner municipal supplies in the country). Bangor and central Maine at 120-200 mg/L on Bangor Water District surface-and-aquifer-supplemented supply. The Down East coastal corridor at 100-200 mg/L on mixed municipal supplies with substantial coastal salt-aerosol overlay. Northern Maine and the Aroostook County corridor at 140-240 mg/L on mixed municipal and aquifer supplies. The lakes-and-mountains corridor at 100-220 mg/L on mixed mountain-source and aquifer-supplemented supplies. Rural Maine well-water through the inland backcountry at 160-340 mg/L on local aquifer and well-water systems.
New Hampshire runs as five working zones. Manchester and the Merrimack Valley corridor at 100-180 mg/L on Manchester Water Works Lake Massabesic-source surface supply. Nashua and the southern NH border-corridor at 120-200 mg/L on Pennichuck Corporation surface-and-aquifer-supplemented supply. Concord and the central NH corridor at 120-200 mg/L on Concord General Services Penacook Lake-source surface supply. Portsmouth and the Seacoast corridor at 100-180 mg/L on Aquarion Water Bellamy Reservoir-source supply with substantial coastal salt-aerosol overlay. The White Mountains and Lakes Region tourism-corridor at 120-260 mg/L on mixed municipal and aquifer supplies. Rural New Hampshire well-water through the Granite State backcountry at 160-340 mg/L on local aquifer and well-water systems.
Rhode Island runs a relatively uniform soft-water profile statewide. Providence Water draws from Scituate Reservoir at 30-70 mg/L — among the softest municipal supplies in the country. Most of Rhode Island runs on Providence Water or interconnected supply at similar hardness. Newport Water runs at 40-80 mg/L. The working problem is not the water — it is the maritime exposure on coastal stock and the substantial pre-1800 colonial heritage concentration in Newport, Providence, and the broader Narragansett Bay corridor.
Vermont runs as three working zones. Burlington and the Champlain Valley corridor at 80-160 mg/L on Champlain Water District Lake Champlain-source surface supply. Central Vermont and the Connecticut River Valley corridor (Montpelier, Barre, White River Junction, Brattleboro) at 100-180 mg/L on mixed municipal supplies. Northern Vermont and the Northeast Kingdom rural corridor at 120-260 mg/L on local aquifer and well-water systems. Rural Vermont well-water statewide variable 140-340 mg/L depending on aquifer source and geology.
Soft surface water across the Boston metro and most of the eastern half of the state from the MWRA Quabbin-Wachusett system; harder groundwater in the central and western tiers; pre-1900 housing density and a four-month salt season are the working drivers.
Moderately hard across most of the state on a patchwork of surface and groundwater supplies; the pre-war housing stock and the spring pollen calendar are bigger working considerations than the water.
A state of two water profiles: soft Catskill/Delaware surface water serving New York City and the lower Hudson, and hard groundwater serving Long Island and most of the rural upstate.
Moderately hard surface water in Philadelphia and Pittsburgh; substantially harder limestone-valley groundwater in the western Philadelphia suburbs and the Lancaster County belt; pre-1900 housing density that dictates the working calendar across most of the state.
The Mid-Atlantic corridor and the Appalachian belt that runs through it. Mixed chemistry, deep heritage, and coal-corridor industrial residue where the topography demands it.
Delaware splits cleanly by county. New Castle County runs Suez/Artesian Brandywine Creek surface-source at 100-150 mg/L. Kent County flips to City of Dover and Tidewater Utilities groundwater at 150-200 mg/L. Sussex coastal beach communities run Tidewater Utilities and smaller systems with brackish-bay plus open-Atlantic salt-aerosol defining coastal chemistry. Brandywine Valley well-water runs harder at 160-220 mg/L with Piedmont iron-clay fraction.
Maryland runs four distinct water profiles tightly clustered geographically. The DC-Maryland WSSC suburbs run Potomac-source (110-150 mg/L) continuous with Northern Virginia. Baltimore City and County run softer Patapsco-source (80-120 mg/L). Eastern Shore runs shallow Coastal Plain aquifer at 100-160 mg/L with brackish-bay salt-aerosol on waterfront stock. Western Maryland flips to Ridge-and-Valley karst groundwater 150-260 mg/L.
Three distinct profiles divide the state. The DC-metro corridor draws from the Potomac at 110-150 mg/L. The Richmond metro and central Piedmont draw from the James River at 70-100 mg/L. The Tidewater is moderate but dominated by salt-aerosol load. West of the Blue Ridge, carbonate-bedrock groundwater pushes hardness to 180-260 mg/L on municipal supply, higher on wells.
The Atlantic coastal Southeast from the Carolinas through the Gulf-adjacent Deep South. Humidity-dominated drying tails and substantial pre-1900 heritage.
Alabama runs four chemistry zones. Birmingham Cahaba River and Lake Purdy reservoir-source supply at 50-90 mg/L typical — genuinely soft, comparable to the South Carolina Midlands. Huntsville Tennessee River-source at 80-130 mg/L moderate. The Black Belt agricultural band runs karst-aquifer groundwater at 180-260 mg/L through Selma, Demopolis, Marengo and Wilcox County corridors. Mobile and the Gulf Coast run Mobile Area Water and Sewer Big Creek Lake at 70-110 mg/L tap-soft but with substantial Gulf and Mobile Bay salt-aerosol overlay.
Moderately soft in the Atlanta metro core (Chattahoochee surface water, 60-95 mg/L), transitioning to harder groundwater in the outer suburbs (Buford limestone, 150-240 mg/L). Coastal Georgia (Savannah, Brunswick) is moderately hard with chloride influence from the Floridan aquifer.
Mississippi runs as four working zones along a north-south axis. Memphis-Sand-aquifer DeSoto County corridor (Southaven, Olive Branch, Hernando) at 80-110 mg/L typical — among the softest municipal water in the South, continuous with the Memphis profile across the state line. Jackson metro and the central Mississippi corridor at 120-180 mg/L through Pearl River-source surface and well-supplemented systems. The Mississippi Delta agricultural belt (Greenwood, Cleveland, Greenville, Clarksdale) at 200-340 mg/L well-water on most rural systems. The Gulf Coast corridor (Biloxi, Gulfport, Pascagoula, Ocean Springs, Bay St. Louis) at 80-130 mg/L surface-source tap, but the open-Gulf salt-aerosol overlay defines the working chemistry.
Moderate across the major metros, with a meaningful split between Charlotte (Catawba surface water, 50-100 mg/L) and the Triangle (Falls Lake, Jordan Lake, Lake Michie, OWASA reservoirs, 50-130 mg/L depending on city). Western mountains run soft. Eastern coastal plain and outer banks run harder on groundwater-supplemented blends.
South Carolina splits into four chemistry zones along Upstate / Midlands / Lowcountry / Grand Strand boundaries. The Upstate runs Greenville Water Table Rock and North Saluda reservoirs at 30-70 mg/L — among the softest municipal supplies in the country. The Midlands runs Columbia Water Lake Murray supply at 50-90 mg/L. The Lowcountry runs Charleston Water System Edisto-and-Bushy-Park supply at 60-110 mg/L with substantial coastal salt-aerosol exposure. The Grand Strand runs Grand Strand Water and Sewer Authority at 70-130 mg/L with open-Atlantic salt aerosol.
The Gulf, the Mid-South, and the lower Mississippi Valley. The hardest-working summer production calendars in the country.
Arkansas runs as four working zones. Little Rock and central Arkansas at 90-160 mg/L on Central Arkansas Water Lake Maumelle and Lake Winona surface supply (soft, comparable to Memphis Sand-aquifer range). Northwest Arkansas (Fayetteville, Bentonville, Rogers, Springdale) at 100-180 mg/L on Beaver Water District Beaver Lake surface supply. The Arkansas River Valley corridor (Fort Smith, Russellville) at 120-200 mg/L on Arkansas River-and-aquifer-supplemented supply. The Delta and eastern Arkansas (Jonesboro, West Memphis, Pine Bluff) at 140-260 mg/L on Mississippi Embayment alluvial-aquifer supply. The Ozark and Ouachita rural well-water at 160-340 mg/L on local aquifer and well-water systems.
Moderate to hard across most populated coastal Florida; the unique variable is salt aerosol, not the tap.
Louisiana runs as three distinct working zones. New Orleans and the metro corridor at 90-140 mg/L on Sewerage and Water Board Mississippi River-source supply with substantial organic-load fraction. Baton Rouge and the central Louisiana corridor at 130-200 mg/L on Baton Rouge Water Company Southern Hills aquifer and Mississippi River-supplemented systems. North Louisiana through Shreveport, Monroe, and the Sportsman's Paradise corridor at 160-260 mg/L on local aquifer and reservoir systems. The Acadiana corridor (Lafayette, Lake Charles, New Iberia) runs 180-280 mg/L on Chicot aquifer and reservoir-source systems.
Oklahoma runs three chemistry zones. Oklahoma City Water Utilities composite supply (Lake Hefner, Lake Overholser, Lake Stanley Draper, plus Atoka and McGee Creek pipeline imports) at 140-220 mg/L moderate-to-hard. Tulsa Water Spavinaw Creek and Lake Eucha Ozark-watershed supply at 80-130 mg/L substantially softer. Panhandle and western Oklahoma well-water on Ogallala and Permian aquifers at 300-500 mg/L — the hardest chemistry in the state and comparable to the worst Texas Hill Country profiles.
Hard to very hard statewide on a mix of surface water and deep aquifers; hill-country well water runs the hardest residential water in the lower 48.
The Great Lakes, the upper Midwest, and the Plains. Continuous water-chemistry gradients running from Chicago lake-source supply to the Bakken-adjacent Dakotas.
A meaningful split between Twin Cities surface-water sources (Mississippi River for Minneapolis, glacial-lake reservoirs for Saint Paul, 70-120 mg/L) and the outer-ring suburban groundwater pulled from the Prairie du Chien-Jordan aquifer (140-200 mg/L). The hardness difference between adjacent municipalities can be substantial. Lake-country sources vary widely, generally moderate.
Two distinct water profiles divide the state. The eastern lakeshore corridor (Milwaukee, Racine, Kenosha, Sheboygan, Green Bay) pulls Lake Michigan and runs moderate at 130-170 mg/L. Interior and western Wisconsin runs deep sandstone-and-dolomite aquifer water that is harder and iron-bearing (Madison and Dane County 200-300 mg/L, central sand counties 280-400 mg/L). The Driftless Area in the southwest is a soft-water exception (80-120 mg/L).
A divided state — Lake Michigan-fed cities are moderate; everywhere else runs hard to very hard on groundwater.
Three distinct profiles divide the state. Northwest Indiana runs Lake Michigan supply continuous with Chicago (130-170 mg/L). Indianapolis and central Indiana run surface-water at 110-150 mg/L, with ring-suburb variance (Carmel/Westfield moderate, Boone County 160-220 mg/L). Southern Indiana karst country (Bloomington, Bedford, French Lick) runs limestone-aquifer water at 140-200 mg/L with sub-micron suspended-particulate. Evansville Ohio River-source moderate.
Iowa runs as one of the hardest municipal-water states in the country. Des Moines Water Works runs Des Moines and Raccoon River supply at 280-340 mg/L. Cedar Rapids runs Cedar River at 220-280 mg/L. Iowa City runs municipal at 250-300 mg/L. Davenport runs Mississippi River at 200-260 mg/L. The agricultural-belt small-town municipals mostly run 250-350 mg/L. Rural private well supply runs 350-500 mg/L on limestone-aquifer-influenced groundwater.
Kansas runs as one of the hardest municipal-water states in the country alongside Iowa and parts of Texas. Wichita Water Department draws from Cheney Reservoir and the Equus Beds aquifer at 280-340 mg/L. Kansas City Kansas runs Missouri River at 240-280 mg/L. Topeka Water draws Kansas River and Lake Sherwood at 220-280 mg/L. Lawrence runs Kansas River at 200-260 mg/L. Western Kansas wheat-belt municipals and rural well supply run 350-500 mg/L on Ogallala and Dakota aquifer groundwater.
Moderately hard surface water on the Detroit metro and the western Lake Michigan corridor; very hard well water across the outstate limestone belt and a heavy salt-aerosol overlay across the whole state in winter.
Missouri splits into four chemistry zones along Kansas City / St. Louis / Springfield-Ozarks / Bootheel boundaries. Kansas City Water draws Missouri River-source at 220-280 mg/L. St. Louis runs Mississippi-and-Missouri River-source supply at 120-180 mg/L (substantially softer because of softening treatment). Springfield runs City Utilities Fellows Lake at 60-110 mg/L plus Ozark-karst well-water at 250-350 mg/L in surrounding counties. The Bootheel runs mixed alluvial supply at 150-220 mg/L.
Nebraska runs as a hardness gradient west across the state. Omaha and the Missouri River corridor at 140-220 mg/L on Metropolitan Utilities District Missouri River and aquifer-supplemented supply. Lincoln and the Lower Platte corridor at 160-240 mg/L on Lincoln Water System aquifer and Platte River-supplemented supply. Central Nebraska through Grand Island, Kearney, and Hastings at 200-300 mg/L on local aquifer systems. Western Nebraska and the Panhandle through North Platte, Scottsbluff, and Sidney flips to Ogallala-aquifer rural well-water at 280-450 mg/L typical, with sub-micron suspended-particulate fraction on the worst-affected systems.
North Dakota runs as three working zones. The Red River Valley corridor (Fargo, Grand Forks, West Fargo) at 80-140 mg/L on Fargo Water Treatment Plant Red River and Sheyenne River-source supply with substantial seasonal organic-load variation. The central Missouri River corridor (Bismarck, Mandan, Williston) at 140-220 mg/L on Missouri River-source municipal supply. The western North Dakota Bakken-corridor residential and rural well-water (Williston, Watford City, Dickinson) at 200-380 mg/L on Fox Hills-Hell Creek aquifer and well-water supply. Rural North Dakota well-water statewide variable 200-450 mg/L depending on aquifer source.
Three distinct urban water profiles — Cleveland on Lake Erie, Columbus on Scioto-and-groundwater, Cincinnati on the Ohio River — with very hard well water across the outstate limestone belt and a north-south gradient in winter salt severity.
South Dakota runs as four working zones. Sioux Falls and the eastern corridor at 130-220 mg/L on Sioux Falls Water Big Sioux aquifer and surface-supplemented supply. Rapid City and the Black Hills corridor at 100-180 mg/L on Rapid City Water mountain-source and Madison-aquifer-supplemented supply. The central South Dakota Pierre and Missouri River corridor at 160-260 mg/L on Missouri River-source and aquifer-supplemented supply. Western South Dakota rural well-water through the Sandhills-adjacent and Pine Ridge-adjacent corridors at 220-400 mg/L on local aquifer and well-water systems. Reservation-adjacent residential through Pine Ridge, Rosebud, Cheyenne River, Standing Rock, Crow Creek, and Lower Brule operates on its own residential category.
High-elevation UV-accelerated IGU degradation, hard mineral water across most of the corridor, and the country’s most operationally distinctive ultra-luxury second-home commercial book.
Moderately soft on the metro Denver tap (60-80 mg/L) when Denver Water blends Dillon and Williams Fork high-altitude reservoir sources with South Platte intake. Significantly harder in Colorado Springs (130-180 mg/L) and on the Western Slope (Grand Junction 200-280 mg/L). Boulder and Fort Collins fall in the moderate band (40-90 mg/L). The Front Range overall runs a city-by-city patchwork that is more variable than any other state we have profiled.
Idaho runs as five working zones. Boise and the Treasure Valley at 250-380 mg/L on Boise Water Snake River Plain aquifer supply (hard chemistry with substantial post-2010 boom-residential coated-glass concentration). Idaho Falls and eastern Idaho at 200-340 mg/L on Snake River-and-aquifer-supplemented supply. Coeur d'Alene and the northern Idaho panhandle at 120-220 mg/L on Spokane Valley-Rathdrum Prairie aquifer-and-surface supply (softer than the Snake River Plain). The Sun Valley and Ketchum ski-corridor at 100-200 mg/L on mountain-source and aquifer-supplemented supplies with high-elevation UV overlay. The Sandpoint and Lake Pend Oreille tourism corridor at 110-180 mg/L on lake-source supply. Rural Idaho well-water statewide variable 200-400 mg/L on local aquifer and well-water systems.
Montana runs as four working zones. Billings and the Yellowstone Valley corridor at 200-340 mg/L on Billings Water Yellowstone River-and-aquifer-supplemented supply. Missoula and the western Montana corridor at 140-220 mg/L on Mountain Water Company aquifer supply (softer than the eastern Montana profile). The Bozeman, Helena, Great Falls, and central Montana corridor at 160-260 mg/L on mixed municipal supplies. The northwest Montana lakes corridor (Kalispell, Whitefish, Polson) at 130-200 mg/L on Flathead aquifer-and-lake-source supply. The Bakken-adjacent eastern Montana corridor (Glendive, Sidney, Wolf Point, Miles City) at 240-400 mg/L on hard aquifer and well-water systems. Rural Montana well-water statewide variable 200-400 mg/L.
Utah runs as a hardness gradient along the Wasatch Front. Salt Lake City Department of Public Utilities Wasatch-canyon-source surface supply at 130-200 mg/L typical (with seasonal snowmelt variation). Jordan Valley Water Conservancy District suburban Salt Lake County supply at 180-260 mg/L moderately hard. Utah Valley municipal corridor (Provo, Orem, American Fork, Lehi) at 200-300 mg/L hard. Utah Valley well-water rural-exurban edge at 280-380 mg/L. Park City and Deer Valley municipal at 200-280 mg/L plus surrounding Heber Valley well-water exposure.
Wyoming runs as six working zones. Cheyenne and the southeastern Wyoming corridor at 200-300 mg/L on Cheyenne Board of Public Utilities Crow Creek and aquifer-supplemented supply. Casper and the central Wyoming corridor at 180-280 mg/L on Casper Water and Casper Mountain-source supply. Laramie and the high-elevation southeastern Wyoming corridor at 160-240 mg/L on Casper Aquifer-source supply. Jackson Hole and the Teton corridor at 140-220 mg/L on Jackson Hole municipal supplies. The Yellowstone-adjacent Cody corridor and northwest Wyoming at 180-260 mg/L on Cody Water and surrounding municipal supplies. The Bakken-adjacent Powder River Basin corridor (Gillette, Sheridan, Buffalo, Wright, Newcastle) at 220-380 mg/L on Gillette-Madison Water and surrounding municipal supplies — among the hardest municipal water in the Mountain West. Rural ranching well-water statewide variable 200-400 mg/L.
Nevada splits cleanly into two zones along the Las Vegas / Reno-Tahoe boundaries. Las Vegas Valley Water District draws Lake Mead and Colorado River at 280-340 mg/L with mineral concentration from long Lake Mead retention. Reno runs Truckee Meadows Water Authority Truckee River-source at 80-140 mg/L — substantially softer because Sierra Nevada snowmelt source profile. Carson City runs mixed supply at 130-180 mg/L. Rural Nevada wells vary widely but typically 250-450 mg/L.
New Mexico runs as a hardness gradient driven by aquifer source and elevation. Albuquerque and the Middle Rio Grande corridor at 180-280 mg/L on Albuquerque Bernalillo County Water Utility Authority aquifer and San Juan-Chama Drinking Water supply. Santa Fe and the northern corridor at 140-220 mg/L on Santa Fe Buckman Direct Diversion and aquifer-supplemented supply. Las Cruces and the southern Rio Grande corridor at 220-330 mg/L on Las Cruces Utilities aquifer supply. Roswell, Carlsbad, and the southeastern Permian Basin corridor at 280-450 mg/L on Pecos River alluvial-aquifer and well-water supply. Farmington, Gallup, and the western reservation-adjacent corridor at 200-340 mg/L on San Juan River and aquifer supply.
The Pacific corridor from Seattle to San Diego plus the desert Southwest extension. Marine-layer chemistry, salt-spray coastal exposure, and the densest coated-glass IGU concentration in the country.
Alaska runs as four working zones. Anchorage and the Cook Inlet corridor at 60-110 mg/L on Anchorage Water and Wastewater Utility Eklutna Lake-and-Ship Creek surface supply (among the softest municipal water in the country). The Mat-Su Valley and Kenai Peninsula corridor at 80-280 mg/L on mixed municipal and well-water supplies. Fairbanks and the interior corridor at 120-220 mg/L on Golden Heart Utilities Chena River-and-aquifer-supplemented supply with substantial iron-and-manganese fraction. Juneau and the Southeast Panhandle corridor at 40-90 mg/L on Southeast Alaska municipal supplies (very soft, precipitation-fed). Rural bush Alaska well-water and surface-water statewide variable 60-400 mg/L.
Hawaii runs as four working zones across the four major inhabited islands. Oahu and the Honolulu metro on Honolulu Board of Water Supply Pearl Harbor aquifer-and-mixed supply at 60-140 mg/L (soft-to-moderate, softer on leeward Pearl Harbor aquifer distribution, moderate on windward Kailua-Kaneohe). Maui on Maui Department of Water Supply mixed-aquifer supply at 80-180 mg/L (moderate, harder on Upcountry, softer on East Maui Hana coast). Big Island on County of Hawaii Department of Water Supply mixed supply at 60-220 mg/L (wide range — softer on Hilo-side surface and precipitation-fed distribution, harder on Kona-side aquifer-source distribution). Kauai on Kauai Department of Water mixed-aquifer-and-surface supply at 60-140 mg/L (soft-to-moderate, softer on North Shore precipitation-fed distribution).
Soft on the west side of the Cascades (Bull Run, McKenzie, Clackamas surface sources, 8-30 mg/L), distinctly harder in the central and eastern half of the state (Deschutes, Klamath basins, 120-260 mg/L). Bend and the eastern slopes pull from volcanic-aquifer groundwater that runs noticeably harder than the metro Portland tap.
Hard to extremely hard at the tap across nearly the entire populated state; the Colorado River blend is the through-line.
The most varied water profile of any state — a patchwork of six major districts, each with its own source, treatment, and hardness profile, plus a meaningful population of Central Valley wells.
Very soft surface water across the Puget Sound corridor from the Cascade snowmelt watersheds; harder basalt-aquifer groundwater on the eastern side of the Cascades; the moss-and-algae substrate problem is the cleaning driver, not the water.
All fifty states are now covered. The most recent coverage extends the corpus into the Pacific-extension states — Alaska across four working zones (Anchorage and Cook Inlet, the Fairbanks ice-fog interior, the Juneau and Southeast Panhandle rainforest, and the Aleutian and Cook Inlet volcanic-ash overlay) and Hawaii across four-island geography (Oahu, Maui, the Big Island Kona-Hilo split with continuous Kilauea vog residue, and Kauai with the Mount Waialeale rainforest pattern). The Hawaii coverage establishes the framework reference for chronic chloride-aerosol handling at substantially higher intensity than the Gulf Coast pattern.
For the operating protocols that cut across regional chemistry, see the article index and the glossary. For the editorial team that writes these state pages, see the contributors page.