Boerne, TX Water Quality 2026: Hard Water Data for Kendall County Homeowners

Does Boerne, TX have hard water?

Yes, and Boerne water is typically harder than the San Antonio metro average. The Water Quality Association classifies water as very hard at anything above 14 grains per gallon. City of Boerne municipal water routinely falls in the 17 to 25 grains per gallon range based on data from the City of Boerne Consumer Confidence Report (boerne.org/utilities) and Edwards Aquifer Authority well sampling records (edwardsaquifer.org). That is meaningfully harder than the 15 to 22 gpg range San Antonio Water System reports for its Bexar County service zone.

The hardness difference comes from geology. Boerne sits in Kendall County on the margin of the Edwards Aquifer recharge zone, where groundwater travels through dense Cretaceous limestone formations before reaching production wells. The longer and deeper the flow path through the limestone, the more calcium and magnesium the water picks up. Kendall County wells in the western Edwards Aquifer zone draw from formations that tend to yield harder water than the main Bexar County aquifer wells feeding SAWS.

The practical effects accumulate quickly in any Boerne home without a softener: calcium carbonate scale on showerheads and faucets, mineral film on glassware from the dishwasher, stiff towels and faded clothing, and accelerated scale buildup inside water heaters and appliances. At 17 to 25 gpg, scale deposits form faster than at the San Antonio city average.

Verify current hardness at your specific address with the City of Boerne annual Consumer Confidence Report or a free in-home water test, since hardness varies between distribution zones and changes with aquifer conditions. For a broader view of hardness across the True H2O service area, read the San Antonio water quality by zone article.

Where does Boerne get its drinking water?

The City of Boerne Utilities operates a public water system drawing from Edwards Aquifer production wells within Kendall County. The Texas Commission on Environmental Quality (TCEQ) regulates this system and requires the city to publish an annual Consumer Confidence Report disclosing all detected contaminants and any regulatory violations. Current and past reports are available at boerne.org/utilities.

Leon Water Supply Corporation serves portions of the rural Kendall County area outside the city limits. Leon WSC, like most rural water supply corporations in the Hill Country, draws from a mix of Edwards Aquifer and Trinity Aquifer wells depending on available groundwater and permit levels. TCEQ lists all active public water systems in Kendall County in its Public Drinking Water System database at tceq.texas.gov.

A significant portion of Kendall County residents in rural areas and newer Hill Country developments rely on private wells rather than either municipal system. Private well customers draw from the Trinity Aquifer or from shallower Edwards Aquifer zones not connected to the city water system. Private well water is not subject to routine TCEQ monitoring. The Edwards Aquifer Authority publishes groundwater quality data from its well network, which provides a regional reference, but individual well chemistry varies with depth, geology, and proximity to agricultural land (edwardsaquifer.org).

The City of Boerne does not blend its supply with surface water from Canyon Lake the way SAWS does. This means Boerne customers receive consistent groundwater chemistry year-round rather than the seasonal hardness shifts that occur in SAWS zones when Canyon Lake blending increases during drought periods.

Boerne water hardness compared to other Hill Country cities: 2026 public data

The table below compiles typical hardness ranges for each major utility serving the True H2O service area, drawn from their published Consumer Confidence Reports and water quality data. Ranges reflect the most recent available CCR data; verify current figures directly with the listed utility before making treatment decisions.

City of Boerne (Edwards Aquifer, Kendall County wells): 17 to 25 gpg, very hard. Source: City of Boerne CCR 2024, boerne.org/utilities.

San Antonio Water System (Edwards Aquifer and Canyon Lake blend, Bexar County): 15 to 22 gpg, very hard. Source: SAWS CCR 2023, saws.org.

New Braunfels Utilities (Canyon Lake and Comal Springs, GBRA source): 14 to 20 gpg, very hard. Source: NBU water quality report, nbutexas.com.

Schertz-Seguin Local Government Corporation (Canyon Lake, GBRA source, serving Schertz and Cibolo): 16 to 22 gpg, very hard. Source: SSLGC annual water quality report, sslgc.org.

Kendall County private wells (Trinity Aquifer): 20 to 28 gpg, very hard. Source: Edwards Aquifer Authority well sampling data, edwardsaquifer.org; USGS Texas Water Science Center groundwater quality records, txpub.usgs.gov.

All utilities in the True H2O service area fall in the very hard classification. Boerne and Kendall County well water sit at the harder end of the regional range. SAWS blending with Canyon Lake surface water introduces seasonal variability; Boerne municipal customers on pure Edwards Aquifer groundwater see more consistent (and typically higher) hardness readings year-round.

These ranges are compiled from publicly available reports. For hardness at your specific address, a calibrated in-home water test provides the most accurate reading. True H2O provides free in-home water testing across Boerne and Kendall County. Call (210) 726-6895.

What else does the Boerne water quality report show?

Beyond hardness, the City of Boerne Consumer Confidence Report discloses the contaminants TCEQ requires all public water systems to test for and report. For Boerne groundwater customers, the contaminants most relevant to treatment decisions are consistent with Edwards Aquifer water quality across the region.

Radionuclides: Edwards Aquifer groundwater in Kendall County can contain elevated combined radium (radium-226 and radium-228) at levels above the trace readings more common in Bexar County SAWS water. The EPA maximum contaminant level for combined radium is 5 picoCuries per liter. Customers concerned about radium exposure, particularly private well owners in the area, should request the current City of Boerne CCR data or test their well through a TCEQ-certified laboratory. An under-sink reverse osmosis system reduces radium at the drinking tap (EPA, epa.gov/radionuclides-drinking-water).

Disinfection byproducts: City of Boerne water is disinfected before distribution. Disinfection byproducts, including trihalomethanes and haloacetic acids, are monitored and disclosed in the annual CCR. Because Boerne draws from groundwater rather than surface water, disinfection byproduct levels are typically lower than in utilities blending with Canyon Lake surface water. Verify current figures with the Boerne CCR.

Iron and sulphur: Private well customers in Kendall County report iron staining (orange deposits on fixtures) and hydrogen sulphide odor (rotten egg smell) more frequently than city utility customers. Both issues reflect naturally occurring mineral chemistry in the Trinity Aquifer zones that serve rural areas. Iron staining above 0.3 milligrams per liter requires a dedicated iron removal stage installed before a water softener; running iron-bearing water through softener resin fouls the resin bed and shortens system life.

For a full contaminant disclosure, consult the current City of Boerne Consumer Confidence Report at boerne.org/utilities. For private well owners, a comprehensive lab panel from a TCEQ-certified laboratory (tceq.texas.gov) is the only reliable way to understand your specific well chemistry.

What water treatment do Boerne homeowners need?

For City of Boerne municipal customers, a whole-home ion exchange water softener is the first-priority treatment at 17 to 25 gpg. At that hardness level, a correctly sized softener removes calcium and magnesium before water reaches any fixture, appliance, or pipe in the home. The financial return from preventing water heater and appliance damage at Boerne hardness levels is strong. The U.S. Department of Energy has documented that scale buildup from hard water reduces water heater energy efficiency and shortens service life (energy.gov/energysaver). Verify whether your specific address needs a 32,000, 48,000, or 64,000 grain capacity system based on an in-home hardness reading and household size, not a zone estimate.

Boerne customers who want to address both hard water and chlorine taste from disinfection treatment can add a whole-home carbon prefiltration stage downstream of the softener. Carbon filtration removes chlorine and chloramines, reducing taste-and-odor compounds from disinfection without affecting hardness removal.

An under-sink reverse osmosis unit at the kitchen tap provides the highest level of drinking water purity: it removes residual dissolved minerals, disinfection byproducts, and provides a meaningful reduction in radium and other dissolved metals at the point of use. NSF-certified RO systems under NSF/ANSI Standard 58 are verified for the contaminant categories most relevant to Edwards Aquifer groundwater (NSF International, nsf.org).

For private well customers in Kendall County: always start with a comprehensive water test before selecting equipment. Iron, sulphur, bacteria, nitrates, and radium each require specific treatment approaches. A softener installed without iron pretreatment in high-iron well water will need resin replacement years ahead of schedule. True H2O evaluates private well water test results before recommending any system configuration. Call (210) 726-6895 to schedule a free in-home consultation.

Is Boerne, TX tap water safe to drink?

City of Boerne municipal water is regulated by the Texas Commission on Environmental Quality, which requires the system to meet all EPA Safe Drinking Water Act primary standards and to notify customers of any violations. Customers can verify the most recent compliance status in the City of Boerne annual Consumer Confidence Report at boerne.org/utilities. A utility in compliance with all primary standards is delivering water that meets the federal definition of safe for all normal household uses.

Private well water in Kendall County is not subject to routine regulatory monitoring. The TCEQ recommends annual testing for bacteria and nitrates as a minimum safety check for all private well owners, with a more comprehensive panel every three to five years (tceq.texas.gov/water/utilities/local-water-supply/drinking-water-data.html). Coliform bacteria in well water is a health risk that requires immediate treatment; nitrates above 10 milligrams per liter pose risk to infants. Neither of these issues is detectable without testing.

For households on either city water or well water, the most common reason Boerne residents seek water treatment is water quality and appliance protection rather than safety: hardness at 17 to 25 gpg causes visible scale and real appliance damage, and customers want to address those effects. Schedule a free in-home water test with True H2O at (210) 726-6895. We serve Boerne, Fair Oaks Ranch, and surrounding Kendall County communities with free water testing and no-obligation equipment recommendations.