Hardness
Moderately hard to very hard103–236mg/L as CaCO₃
Range of six source averages
USGS: hard >120; very hard >180 mg/L
Source averages ≈ 6.0–13.8 gpg. Full source range: 78–280 mg/L. Your blend can differ.
2025View source
- 1Your water
- 2Your home
- 3Your system
Los Angeles County water reports & provider guide
Showing utility report
Los Angeles Department of Water and Power (LADWP)
2025 utility report; each result retains its sampling year
Only use these results if Los Angeles Department of Water and Power (LADWP) is the supplier on your bill. Other utilities and private wells need their own data.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Disinfectant residual
Below 4 mg/L MRDL1.7mg/L
Total chlorine · highest running annual average
LADWP uses chloramines; this is total residual, not a free-chlorine-only reading.
2025View source
TTHM
Below 80 ppb MCL33.8ppb
Highest locational running annual average
2025View source
HAA5
Below 60 ppb MCL13.4ppb
Highest locational running annual average
2025View source
Fluoride
Below California 2 mg/L MCL0.7mg/L
Citywide average · range 0.2–0.8
Dedicated fluoride treatment is a separate selection.
2025View source
Lead
System percentile below action level; see tap results<5ppb
90th percentile · 105 sampled taps
3 of 105 sites exceeded 15 ppb. A low system percentile does not rule out lead at an individual home.
2023View source
Arsenic
Below 10 ppb MCL<2–3.3ppb
Range of source averages · overall range <2–7.0
The legal limit differs from California’s 0.004 ppb health goal.
2025View source
PFAS
Below reporting limitsNot detected
Tested PFAS at distribution entry points
Historical UCMR5 results are not a current home test or proof of zero PFAS.
Dec 2023–Sep 2024View source
Showing utility report
Long Beach Utilities — MWD zone 114
2025 utility report; sampling years shown beside each result
Select this exact provider and supply system. A city, county or ZIP match alone does not confirm the water reaching your home.
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 average220mg/L as CaCO₃
zone average; range 100–300
USGS hardness classes
About 12.9 gpg, calculated from mg/L. Confirm your supply zone and current hardness before choosing treatment.
2025View source
Chloramine
Below the 4 mg/L limit2.15mg/L
citywide highest annual average; range 0.33–2.84
MRDL: 4 mg/L
This citywide result applies to both reported zones; filtration should be selected for chloramine.
2025View source
TTHMs
Below the 80 ppb limit35µg/L (ppb)
citywide highest locational annual average; range 28–48
MCL: 80 ppb
Value from the original 2025 PDF report. Not an individual tap measurement.
2025View source
HAA5
Below the 60 ppb limit10.2µg/L (ppb)
citywide highest locational annual average; range 5–12
MCL: 60 ppb
2025View source
Fluoride
Below California’s 2 mg/L limit0.69mg/L
zone average; range 0.63–0.74
California MCL: 2 mg/L
Fluoride reduction is a separate treatment goal; standard filtration is not a fluoride-removal promise.
2025View source
Lead
Below the report’s action level<5µg/L (ppb)
citywide 90th percentile; 63 sampled taps
Report action level: 15 ppb
The report says <DLR; its footnote defines lead DLR as 5 ppb. No samples exceeded 15 ppb. Your own plumbing still matters.
2025View source
Arsenic
Below the 10 ppb limit1.3µg/L (ppb)
zone average; range 0.9–1.8
MCL: 10 ppb
Below a legal limit does not mean absent.
2025View source
PFAS
Below reporting limitsNot detected29 tested compounds
four quarters of UCMR5 testing
Compound-specific reporting limits
The 2025 report carries forward these historical results. Nondetect does not mean zero.
2023–2024View source
Showing utility report
Long Beach Utilities — Blended zone 325
2025 utility report; sampling years shown beside each result
Select this exact provider and supply system. A city, county or ZIP match alone does not confirm the water reaching your home.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Hardness
Moderately hard average76mg/L as CaCO₃
zone average; range 66–100
USGS hardness classes
About 4.4 gpg, calculated from mg/L. Confirm your supply zone and current hardness before choosing treatment.
2025View source
Chloramine
Below the 4 mg/L limit2.15mg/L
citywide highest annual average; range 0.33–2.84
MRDL: 4 mg/L
This citywide result applies to both reported zones; filtration should be selected for chloramine.
2025View source
TTHMs
Below the 80 ppb limit35µg/L (ppb)
citywide highest locational annual average; range 28–48
MCL: 80 ppb
Value from the original 2025 PDF report. Not an individual tap measurement.
2025View source
HAA5
Below the 60 ppb limit10.2µg/L (ppb)
citywide highest locational annual average; range 5–12
MCL: 60 ppb
2025View source
Fluoride
Below California’s 2 mg/L limit0.72mg/L
zone average; range 0.68–0.77
California MCL: 2 mg/L
Fluoride reduction is a separate treatment goal; standard filtration is not a fluoride-removal promise.
2025View source
Lead
Below the report’s action level<5µg/L (ppb)
citywide 90th percentile; 63 sampled taps
Report action level: 15 ppb
The report says <DLR; its footnote defines lead DLR as 5 ppb. No samples exceeded 15 ppb. Your own plumbing still matters.
2025View source
Arsenic
Below the 10 ppb limit0.6µg/L (ppb)
zone average; range 0.4–0.8
MCL: 10 ppb
Below a legal limit does not mean absent.
2025View source
PFAS
Below reporting limitsNot detected29 tested compounds
four quarters of UCMR5 testing
Compound-specific reporting limits
The 2025 report carries forward these historical results. Nondetect does not mean zero.
2023–2024View source
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.
Find My Water System →Private well? Start with a current water test.
A city report cannot establish a well’s water quality. Well-water treatment depends on your test results and site conditions.
Explore well-water systems →Water hardness by provider
The figures below are provider-specific. They are not a countywide average.
| Utility | Hardness | Hardness source |
|---|---|---|
| 103–236 mg/L · Moderately hard to very hard | 2025 reported hardness | |
| 220 mg/L as CaCO₃ · Very hard average | 2025 · zone average; range 100–300 | |
| 76 mg/L as CaCO₃ · Moderately hard average | 2025 · zone average; range 66–100 |
View Full Water ReportOpen the measured results, dates, comparisons and original utility report.
The numbers behind your report
Selected results with the original sampling dates and measurement basis. Open the utility report for every parameter, notice and footnote.
Open the complete utility report ↗
| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 103–236 mg/L as CaCO₃Range of six source averages | 2025View source ↗ | Moderately hard to very hardSource averages ≈ 6.0–13.8 gpg. Full source range: 78–280 mg/L. Your blend can differ. |
| Disinfectant residual | 1.7 mg/LTotal chlorine · highest running annual average | 2025View source ↗ | Below 4 mg/L MRDLLADWP uses chloramines; this is total residual, not a free-chlorine-only reading. |
| TTHM | 33.8 ppbHighest locational running annual average | 2025View source ↗ | Below 80 ppb MCL |
| HAA5 | 13.4 ppbHighest locational running annual average | 2025View source ↗ | Below 60 ppb MCL |
| Fluoride | 0.7 mg/LCitywide average · range 0.2–0.8 | 2025View source ↗ | Below California 2 mg/L MCLDedicated fluoride treatment is a separate selection. |
| Lead | <5 ppb90th percentile · 105 sampled taps | 2023View source ↗ | Below 15 ppb action level3 of 105 sites exceeded 15 ppb. A low system percentile does not rule out lead at an individual home. |
| Arsenic | <2–3.3 ppbRange of source averages · overall range <2–7.0 | 2025View source ↗ | Below 10 ppb MCLThe legal limit differs from California’s 0.004 ppb health goal. |
| PFAS | Not detected Tested PFAS at distribution entry points | Dec 2023–Sep 2024View source ↗ | Below reporting limitsHistorical UCMR5 results are not a current home test or proof of zero PFAS. |
| Nitrate as nitrogen | <0.4 mg/L as NAll six source averages · highest reported sample 1.4 | 2025View source ↗ | Below 10 mg/L MCL |
| Copper | 529 ppb90th percentile · 105 sampled taps | 2023View source ↗ | Below 1,300 ppb action level0 of 105 sites exceeded the action level. |
| Total dissolved solids | 234–545 mg/LRange of source averages · full range 187–625 | 2025View source ↗ | Below 1,000 mg/L secondary MCLAesthetic standard; TDS is not a hardness measurement. |
| Hardness — Los Angeles Aqueduct Filtration Plant | 103 mg/L as CaCO₃Source average · range 96–117 | 2025View source ↗ | Moderately hardCalculated average: 6.0 gpg. Use the report’s service-area map to understand your blend. |
| Hardness — Northern Combined Wells | 115 mg/L as CaCO₃Source average · range 78–151 | 2025View source ↗ | Moderately hardCalculated average: 6.7 gpg. Use the report’s service-area map to understand your blend. |
| Hardness — Southern Combined Wells | 116 mg/L as CaCO₃Source average · range 83–159 | 2025View source ↗ | Moderately hardCalculated average: 6.8 gpg. Use the report’s service-area map to understand your blend. |
| Hardness — MWD Weymouth Plant | 234 mg/L as CaCO₃Source average · range 189–280 | 2025View source ↗ | Very hardCalculated average: 13.7 gpg. Use the report’s service-area map to understand your blend. |
| Hardness — MWD Diemer Plant | 236 mg/L as CaCO₃Source average · range 191–280 | 2025View source ↗ | Very hardCalculated average: 13.8 gpg. Use the report’s service-area map to understand your blend. |
| Hardness — MWD Jensen Plant | 140 mg/L as CaCO₃Source average · range 137–142 | 2025View source ↗ | HardCalculated average: 8.2 gpg. Use the report’s service-area map to understand your blend. |
In drinking water, ppm ≈ mg/L, ppb ≈ µg/L and ppt ≈ ng/L. Calculated hardness in grains per US gallon (gpg) = mg/L as CaCO₃ ÷ 17.118, rounded to one decimal. ND means below the reporting limit, not zero.
MCL is an enforceable contaminant limit; MRDL is a disinfectant limit. A PHG is a health goal, not the legal limit. Lead/copper action levels use system sampling percentiles, not a safe-tap threshold. TTHM/HAA5 comparisons use locational running annual averages.
PFAS results are compound-specific. Source monitoring, entry-point samples and tap tests are different. Notification and response levels in a utility report are not maximum contaminant levels; do not infer a compliance violation from a single value. 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. Los Angeles Aqueduct, local groundwater and Metropolitan Water District supplies from the State Water Project and Colorado River Aqueduct.
View Full Water ReportOpen the measured results, dates, comparisons and original utility report.
The numbers behind your report
Selected results with the original sampling dates and measurement basis. Open the utility report for every parameter, notice and footnote.
Open the complete utility report ↗
| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 220 mg/L as CaCO₃zone average; range 100–300 | 2025View source ↗ | Very hard averageAbout 12.9 gpg, calculated from mg/L. Confirm your supply zone and current hardness before choosing treatment. |
| Chloramine | 2.15 mg/Lcitywide highest annual average; range 0.33–2.84 | 2025View source ↗ | Below the 4 mg/L limitThis citywide result applies to both reported zones; filtration should be selected for chloramine. |
| TTHMs | 35 µg/L (ppb)citywide highest locational annual average; range 28–48 | 2025View source ↗ | Below the 80 ppb limitValue from the original 2025 PDF report. Not an individual tap measurement. |
| HAA5 | 10.2 µg/L (ppb)citywide highest locational annual average; range 5–12 | 2025View source ↗ | Below the 60 ppb limit |
| Fluoride | 0.69 mg/Lzone average; range 0.63–0.74 | 2025View source ↗ | Below California’s 2 mg/L limitFluoride reduction is a separate treatment goal; standard filtration is not a fluoride-removal promise. |
| Lead | <5 µg/L (ppb)citywide 90th percentile; 63 sampled taps | 2025View source ↗ | Below the report’s action levelThe report says <DLR; its footnote defines lead DLR as 5 ppb. No samples exceeded 15 ppb. Your own plumbing still matters. |
| Arsenic | 1.3 µg/L (ppb)zone average; range 0.9–1.8 | 2025View source ↗ | Below the 10 ppb limitBelow a legal limit does not mean absent. |
| PFAS | Not detected 29 tested compoundsfour quarters of UCMR5 testing | 2023–2024View source ↗ | Below reporting limitsThe 2025 report carries forward these historical results. Nondetect does not mean zero. |
| Total dissolved solids | 530 mg/Lzone average; range 300–680 | 2025View source ↗ | Below the report’s 1,000 mg/L benchmarkTDS is not a stand-alone safety test. |
| Nitrate | 0.29 mg/Lzone average; range 0.12–0.45 | 2025View source ↗ | Below the report’s 10 mg/L limit |
| Copper | 171 µg/Lcitywide 90th percentile; 63 sampled taps | 2025View source ↗ | Below the 1,300 µg/L action levelNo sampled taps exceeded the action level. |
| Bromate | 0.6 µg/LLong Beach distribution highest annual average | 2025View source ↗ | Below the 10 µg/L limitThe report separately lists a higher value at the MWD treatment-plant outlet. |
| Sodium | 86 mg/Lzone average | 2025View source ↗ | No MCL listed in this report |
| Chloride | 93 mg/Lzone average | 2025View source ↗ | Below the report’s 500 mg/L benchmark |
| Sulfate | 170 mg/Lzone average | 2025View source ↗ | Below the report’s 500 mg/L benchmark |
In drinking water, ppm ≈ mg/L, ppb ≈ µg/L and ppt ≈ ng/L. Calculated hardness in grains per US gallon (gpg) = mg/L as CaCO₃ ÷ 17.118, rounded to one decimal. ND means below the reporting limit, not zero.
MCL is an enforceable contaminant limit; MRDL is a disinfectant limit. A PHG is a health goal, not the legal limit. Lead/copper action levels use system sampling percentiles, not a safe-tap threshold. TTHM/HAA5 comparisons use locational running annual averages.
PFAS results are compound-specific. Source monitoring, entry-point samples and tap tests are different. Notification and response levels in a utility report are not maximum contaminant levels; do not infer a compliance violation from a single value. 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. Imported MWD water in zone 114; local groundwater and imported-water blends in zone 325. The zones have substantially different mineral content.
View Full Water ReportOpen the measured results, dates, comparisons and original utility report.
The numbers behind your report
Selected results with the original sampling dates and measurement basis. Open the utility report for every parameter, notice and footnote.
Open the complete utility report ↗
| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 76 mg/L as CaCO₃zone average; range 66–100 | 2025View source ↗ | Moderately hard averageAbout 4.4 gpg, calculated from mg/L. Confirm your supply zone and current hardness before choosing treatment. |
| Chloramine | 2.15 mg/Lcitywide highest annual average; range 0.33–2.84 | 2025View source ↗ | Below the 4 mg/L limitThis citywide result applies to both reported zones; filtration should be selected for chloramine. |
| TTHMs | 35 µg/L (ppb)citywide highest locational annual average; range 28–48 | 2025View source ↗ | Below the 80 ppb limitValue from the original 2025 PDF report. Not an individual tap measurement. |
| HAA5 | 10.2 µg/L (ppb)citywide highest locational annual average; range 5–12 | 2025View source ↗ | Below the 60 ppb limit |
| Fluoride | 0.72 mg/Lzone average; range 0.68–0.77 | 2025View source ↗ | Below California’s 2 mg/L limitFluoride reduction is a separate treatment goal; standard filtration is not a fluoride-removal promise. |
| Lead | <5 µg/L (ppb)citywide 90th percentile; 63 sampled taps | 2025View source ↗ | Below the report’s action levelThe report says <DLR; its footnote defines lead DLR as 5 ppb. No samples exceeded 15 ppb. Your own plumbing still matters. |
| Arsenic | 0.6 µg/L (ppb)zone average; range 0.4–0.8 | 2025View source ↗ | Below the 10 ppb limitBelow a legal limit does not mean absent. |
| PFAS | Not detected 29 tested compoundsfour quarters of UCMR5 testing | 2023–2024View source ↗ | Below reporting limitsThe 2025 report carries forward these historical results. Nondetect does not mean zero. |
| Total dissolved solids | 280 mg/Lzone average; range 250–320 | 2025View source ↗ | Below the report’s 1,000 mg/L benchmarkTDS is not a stand-alone safety test. |
| Nitrate | ND mg/Lzone average; range ND–0.22 | 2025View source ↗ | Below the report’s 10 mg/L limit |
| Copper | 171 µg/Lcitywide 90th percentile; 63 sampled taps | 2025View source ↗ | Below the 1,300 µg/L action levelNo sampled taps exceeded the action level. |
| Bromate | 0.6 µg/LLong Beach distribution highest annual average | 2025View source ↗ | Below the 10 µg/L limitThe report separately lists a higher value at the MWD treatment-plant outlet. |
| Sodium | 68 mg/Lzone average | 2025View source ↗ | No MCL listed in this report |
| Chloride | 43 mg/Lzone average | 2025View source ↗ | Below the report’s 500 mg/L benchmark |
| Sulfate | 32 mg/Lzone average | 2025View source ↗ | Below the report’s 500 mg/L benchmark |
In drinking water, ppm ≈ mg/L, ppb ≈ µg/L and ppt ≈ ng/L. Calculated hardness in grains per US gallon (gpg) = mg/L as CaCO₃ ÷ 17.118, rounded to one decimal. ND means below the reporting limit, not zero.
MCL is an enforceable contaminant limit; MRDL is a disinfectant limit. A PHG is a health goal, not the legal limit. Lead/copper action levels use system sampling percentiles, not a safe-tap threshold. TTHM/HAA5 comparisons use locational running annual averages.
PFAS results are compound-specific. Source monitoring, entry-point samples and tap tests are different. Notification and response levels in a utility report are not maximum contaminant levels; do not infer a compliance violation from a single value. 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. Imported MWD water in zone 114; local groundwater and imported-water blends in zone 325. The zones have substantially different mineral content.
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More about your local water
What this means for your home
LADWP is the first detailed system covered. Long Beach and Pasadena publish separate reports.
The county includes independent city utilities and other suppliers. A Los Angeles mailing address alone does not establish LADWP service. LADWP itself blends several sources, so hardness varies within its service area.
Related city reports
A useful local question
Can I use one report for all of Los Angeles County?
No. The detailed figures here belong only to Los Angeles Department of Water and Power (LADWP). Use the other-provider links for a different supplier, and current testing for a private well.
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.
Different name on your water bill?
These local providers publish separate reports. Follow the matching utility link; the measurements above do not describe these systems.
- Los Angeles Department of Water and Power (LADWP) ↗2025 utility report; each result retains its sampling year
- Long Beach Utilities — MWD zone 114 ↗2025 utility report; sampling years shown beside each result
- Long Beach Utilities — Blended zone 325 ↗2025 utility report; sampling years shown beside each result
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources checked October 25, 2026
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