Hardness
Very hard275–295 mg/L as CaCO₃
Reported hardness range, varies with groundwater use
USGS very hard: >180 mg/L
2025 report
View source ↗- 1Your water
- 2Your home
- 3Your system
Your local water, explained
Hays County Water Quality Report
Keep Kyle and San Marcos results separate.
Both covered systems have published very-hard-water evidence, but their distribution results differ. Kyle's supplier purchases do not make San Marcos' reported byproduct violation a Kyle customer-system result.
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Your water
Match the name on your water bill.
The report follows your water provider—not your ZIP code or county boundary.
Only the listed water system is summarized here. Choose “Other / not sure” if your bill shows a different supplier.
Confirm the provider on your bill, or choose “Other / not sure” to continue without a matched report.
Utility data is a starting point. It is not a test of your tap or a live advisory. Sources checked October 23, 2026
Choose the right utility report
The figures below are provider-specific. They are not a countywide average.
| Utility | Hardness | Hardness source |
|---|---|---|
| 275–295 mg/L as CaCO₃ · Very hard · USGS very hard: >180 mg/L | 2025 report | |
| 269 mg/L as CaCO₃ · Very hard, historical result · USGS very hard: >180 mg/L | 2024 |
Showing utility report
City of Kyle
2025 report; each row keeps its measurement year
Results for City of Kyle customers on system TX1050002. Other districts and private wells need their own reports.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Free chlorine
Below stated benchmark1.43 ppm
City-system average; range 0.55–2.8
MRDL 4 ppm
2025
View source ↗TTHMs
Below limit67 ppb
Highest LRAA among Kyle's four listed sites, 310 Ayers Rd; site's individual range 47.3–83.8
MCL 80 ppb, LRAA basis
2025
View source ↗HAA5
Below limit25 ppb
Highest LRAA among Kyle's four listed sites, 310 Ayers Rd; range 14–48
MCL 60 ppb, LRAA basis
2025
View source ↗Fluoride
Below primary limit1.83 ppm
Highest reported City-system result
MCL 4 ppm
Naturally occurring; Kyle says it does not add fluoride.
January 8, 2025
View source ↗Lead
Below action level1.91 ppb
90th percentile; range 0–3.9; zero sites above action level
Report action level 15 ppb; MCLG0
2023–2025 monitoring period
View source ↗PFAS
Cannot assess high or lowNot verified
No compound-specific result assessed in this summary
This does not establish whether PFAS are present or absent. Check compound-specific testing before choosing treatment.
2025 report review
View source ↗Nitrate
Below limit1.83 ppm
Highest reported result; range 0–1.83
MCL 10 ppm
January 8, 2025
View source ↗View Full Water ReportOpen the measured results, dates, comparisons and original utility report.
The numbers behind your report
Selected useful results—not a replacement for the utility’s complete report. Older measurements retain their original year.
Open the complete utility report ↗
| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 275–295 mg/L as CaCO₃ Reported hardness range, varies with groundwater use | 2025 reportView source ↗ | Very hard · USGS very hard: >180 mg/L |
| Free chlorine | 1.43 ppm City-system average; range 0.55–2.8 | 2025View source ↗ | Below stated benchmark · MRDL 4 ppm |
| Total trihalomethanes (TTHM) | 67 ppb Highest LRAA among Kyle's four listed sites, 310 Ayers Rd; site's individual range 47.3–83.8 | 2025View source ↗ | Below limit · MCL 80 ppb, LRAA basis |
| Haloacetic acids (HAA5) | 25 ppb Highest LRAA among Kyle's four listed sites, 310 Ayers Rd; range 14–48 | 2025View source ↗ | Below limit · MCL 60 ppb, LRAA basis |
| Fluoride | 1.83 ppm Highest reported City-system result | January 8, 2025View source ↗ | Below primary limit · MCL 4 ppmNaturally occurring; Kyle says it does not add fluoride. |
| Nitrate as nitrogen | 1.83 ppm Highest reported result; range 0–1.83 | January 8, 2025View source ↗ | Below limit · MCL 10 ppm |
| Lead | 1.91 ppb 90th percentile; range 0–3.9; zero sites above action level | 2023–2025 monitoring periodView source ↗ | Below action level · Report action level 15 ppb; MCLG0A system sampling percentile is not a measurement of your faucet. |
| Copper | 0.0975 ppm 90th percentile; range 0.00279–0.241; zero sites above action level | 2023–2025 monitoring periodView source ↗ | Below action level · Action level 1.3 ppmA system sampling percentile is not a measurement of your faucet. |
| PFAS | Not verified No compound-specific result assessed in this summary | 2025 report reviewView source ↗ | Cannot assess high or lowThis does not establish whether PFAS are present or absent. Check compound-specific testing before choosing treatment. |
ppm ≈ mg/L; ppb ≈ µg/L; ppt ≈ ng/L in drinking water. Hardness in gpg = mg/L as CaCO₃ ÷ 17.1. ND means not detected at the method’s reporting limit—not zero.
MCL is a maximum contaminant level. MRDL is a disinfectant limit. Lead/copper action levels use system sampling percentiles and are not a safe-tap threshold. TTHM/HAA5 compliance uses locational annual averages.
PFOA/PFOS comparisons use EPA’s 4 ppt values. Historical detections are not a present compliance finding; EPA assesses compliance using running annual averages. Rule implementation is being reviewed. EPA PFAS benchmarks and implementation ↗
Turn your report into a plan for your home.
Choose the system size, keep useful existing equipment, and review your filtration goals.
Source water. Purchased surface water and treated groundwater: local Edwards/Barton Springs wells, GBRA, City of San Marcos, and Alliance Regional Water Authority.
Showing utility report
City of San Marcos
2025 report; each row keeps its measurement year
Results for City of San Marcos customers on system TX1050001. Other districts and private wells need their own reports.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Hardness
Very hard, historical result269 mg/L as CaCO₃
Average; range 236–302; 2025 report has no replacement figure
USGS very hard: >180 mg/L
2024
View source ↗Free chlorine
Below stated benchmark1.26 ppm
Average; range 0.30–2.42
MRDL 4 ppm
2025
View source ↗TTHMs
Above limit in 202581 ppb
Highest LRAA; individual range 1.1–94.3 ppb
MCL 80 ppb, LRAA basis
Official notice confirms0.081 mg/L=81 ppb. CCR unit/No-violation cells conflict with its own violation section; use the official notice for this interpretation.
2025; Q4 violation
View source ↗HAA5
Below limit25 ppb
Highest LRAA; City of Kyle report's purchased-water San Marcos table confirms units and value
MCL 60 ppb, LRAA basis
San Marcos CCR prints ppm in HAA5 cell; corroborating official supplier-results table usesppb.
2025
View source ↗Fluoride
Below limit0.21 ppm
Highest result; range 0.16–0.21
MCL 4 ppm
January 7, 2025
View source ↗Lead
Below action level1.63 ppb
90th percentile; range 0–2.22; zero sites over AL
Report action level 15 ppb; MCLG0
2022–2024 monitoring period
View source ↗PFAS
Cannot assess high or lowNot verified
No compound-specific result assessed in this summary
This does not establish whether PFAS are present or absent. Check compound-specific testing before choosing treatment.
2025 report review
View source ↗Nitrate
Below limit1.77 ppm
Highest result; range 1.16–1.77
MCL 10 ppm
January 7, 2025
View source ↗View Full Water ReportOpen the measured results, dates, comparisons and original utility report.
The numbers behind your report
Selected useful results—not a replacement for the utility’s complete report. Older measurements retain their original year.
Open the complete utility report ↗
| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 269 mg/L as CaCO₃ Average; range 236–302; 2025 report has no replacement figure | 2024View source ↗ | Very hard, historical result · USGS very hard: >180 mg/L |
| Free chlorine | 1.26 ppm Average; range 0.30–2.42 | 2025View source ↗ | Below stated benchmark · MRDL 4 ppm |
| Total trihalomethanes (TTHM) | 81 ppb Highest LRAA; individual range 1.1–94.3 ppb | 2025; Q4 violationView source ↗ | Above limit in 2025 · MCL 80 ppb, LRAA basisOfficial notice confirms0.081 mg/L=81 ppb. CCR unit/No-violation cells conflict with its own violation section; use the official notice for this interpretation. |
| Haloacetic acids (HAA5) | 25 ppb Highest LRAA; City of Kyle report's purchased-water San Marcos table confirms units and value | 2025View source ↗ | Below limit · MCL 60 ppb, LRAA basisSan Marcos CCR prints ppm in HAA5 cell; corroborating official supplier-results table usesppb. |
| Fluoride | 0.21 ppm Highest result; range 0.16–0.21 | January 7, 2025View source ↗ | Below limit · MCL 4 ppm |
| Nitrate | 1.77 ppm Highest result; range 1.16–1.77 | January 7, 2025View source ↗ | Below limit · MCL 10 ppm |
| Lead | 1.63 ppb 90th percentile; range 0–2.22; zero sites over AL | 2022–2024 monitoring periodView source ↗ | Below action level · Report action level 15 ppb; MCLG0A system sampling percentile is not a measurement of your faucet. |
| Copper | 0.171 ppm 90th percentile; range 0.0133–0.31; zero sites over AL | 2022–2024 monitoring periodView source ↗ | Below action level · Action level 1.3 ppmA system sampling percentile is not a measurement of your faucet. |
| PFAS | Not verified No compound-specific result assessed in this summary | 2025 report reviewView source ↗ | Cannot assess high or lowThis does not establish whether PFAS are present or absent. Check compound-specific testing before choosing treatment. |
ppm ≈ mg/L; ppb ≈ µg/L; ppt ≈ ng/L in drinking water. Hardness in gpg = mg/L as CaCO₃ ÷ 17.1. ND means not detected at the method’s reporting limit—not zero.
MCL is a maximum contaminant level. MRDL is a disinfectant limit. Lead/copper action levels use system sampling percentiles and are not a safe-tap threshold. TTHM/HAA5 compliance uses locational annual averages.
PFOA/PFOS comparisons use EPA’s 4 ppt values. Historical detections are not a present compliance finding; EPA assesses compliance using running annual averages. Rule implementation is being reviewed. EPA PFAS benchmarks and implementation ↗
Turn your report into a plan for your home.
Choose the system size, keep useful existing equipment, and review your filtration goals.
Source water. Edwards Aquifer groundwater, Carrizo-Wilcox Aquifer water via Alliance Regional Water Authority1B, and Canyon Lake surface water pumped from Lake Dunlap.
Your provider needs its own report.
Continue with your home details for general filtration guidance. We will not use another utility’s numbers as your result.
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More about your local water
What this means for your home
Kyle and San Marcos are separate public water systems. San Marcos' 2025 TTHM violation is dated and labelled; its available hardness measurement comes from 2024. County reports cannot replace testing of private wells or reports for separate campus and district systems.
Related city reports
A useful local question
Does a supplier's result automatically apply to every Hays County customer?
No. Distinguish purchased-water supplier testing from results collected in the retail distribution system. Kyle and San Marcos publish different customer-system TTHM results even though Kyle purchases some water from San Marcos.
Sources and methodology
We keep each utility’s results separate, show the reported sample year, and distinguish averages, maxima and tap-sampling percentiles. Hardness classifications use USGS ranges. Missing data stays unknown.
- City of Kyle ↗2025 report; each row keeps its measurement year
- City of San Marcos ↗2025 report; each row keeps its measurement year
- Official utility notice ↗
- City of San Marcos · Hardness source ↗
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources checked October 23, 2026
Your water → your home → your system
Turn your report into a plan for your home.
Choose the system size, keep useful existing equipment, and review your filtration goals.
Your homeFind my system →