Your Local Water Profile: Westwood

This profile explains what the applicable water provider reported for Westwood, what those results may mean throughout a home, and where property-specific testing or inspection may still be needed.

(877) 798-7487

Westwood — a community within Los Angeles.

A water provider's official report describes the public water system and its monitoring period — not every individual home. Plumbing materials, water age, temperature, and equipment can change water after it enters a property. Official report year: 2024.

Water provider: Los Angeles Department of Water and Power (LADWP)

Public water system CA1910067 · 2024 report · 2024 data retained; monitor for the next official update

View the 2024 Los Angeles Department of Water and Power (LADWP) Consumer Confidence Report

What the official water report says

Your water at a glance

Los Angeles Department of Water and Power

The report lists hardness as 103-236 mg/L as CaCO3; this is ranges from moderately hard to very hard on the USGS scale.

USGS hardness scale: 0–60 soft; 61–120 moderately hard; 121–180 hard; >180 very hard, in mg/L as CaCO3.

Source: official report, p. 25

Los Angeles Department of Water and Power (LADWP) — compliance, as reported

The report states: “LADWP met and complied with all the primary drinking water standards in 2025. [p. 3, Regulatory Compliance]”

Violations or advisories, as reported: Chlorate detected above notification level at Cyprean Tank and Highway Highland Tank in January 2026. Solano Reservoir Significant Deficiency identified May 31, 2023 due to roof holes. Maclay Reservoir Significant Deficiency identified October 17, 2025 due to roof holes. Total Trihalomethanes exceeded MCL at Griffith Park in September 2023.

Units used on this page: milligrams per liter (mg/L) — about one part per million in water; micrograms per liter (µg/L) — commonly corresponding to parts per billion in water.

The Three C's — 1 of 3

Chemistry

What does this water tend to do in a home?

Hardness, Total

The utility reported: 103-236 mg/L as CaCO3

Table III · report p. 25 · official report

Calcium

The utility reported: 27-56 mg/L

Table III · report p. 25 · official report

Magnesium

The utility reported: 9-22 mg/L

Table III · report p. 25 · official report

The utility reported: 7.7-8.3 Unit

Table III · report p. 25 · official report

Alkalinity, Total

The utility reported: 98-110 mg/L as CaCO3

Table III · report p. 25 · official report

Total Dissolved Solids (TDS)

The utility reported: 234-545 mg/L

Table II · report p. 24 · official report

Chloride

The utility reported: 36-92 mg/L

Table II · report p. 24 · official report

Sulfate

The utility reported: 41-182 mg/L

Table II · report p. 24 · official report

Sodium

The utility reported: 39-89 mg/L

Table III · report p. 25 · official report

Lead (at-the-tap)

The utility reported: <5 µg/L

Table I (CONT'D) · report p. 23 · official report

Copper (at-the-tap)

The utility reported: 529 µg/L

Table I (CONT'D) · report p. 23 · official report

Chlorine Residual, Total

The utility reported: 1.7 mg/L

Table I (CONT'D) · report p. 23 · official report

Chemistry is not a safety grade, and utility-level values do not guarantee conditions at a property.

The Three C's — 2 of 3

Contaminants

What was reported, and what do the applicable standards mean?

Legal limit — maximum contaminant level (MCL)

The highest level legally allowed in public drinking water under the applicable rule. Do not use MCL as a generic label for goals, action levels, notification levels, or independent guidelines. It is different from a non-enforceable health goal.

California health goal — public health goal (PHG)

A non-enforceable health-protective target developed for standard-setting context. It is not the California legal limit.

Federal health goal — maximum contaminant level goal (MCLG)

A non-enforceable EPA public-health target used in setting standards. It is not the legal limit.

Legal disinfectant-residual limit — maximum residual disinfectant level (MRDL)

The highest level of a drinking-water disinfectant allowed under the applicable rule. It is not an MCL for a contaminant.

Los Angeles Department of Water and Power (LADWP) — regulated contaminants reported as detected (18)

Aluminum

The utility reported: 600 µg/L

Reported range: <50-100

Legal limit (MCL): 1000 · Health goal (PHG): 600 — not an enforceable limit

Violation per report: No

Typical source, per the report: Erosion of natural deposits; residue from surface water treatment processes

Table I · report p. 22 · official report

Arsenic

The utility reported: 3.3 µg/L

Reported range: <2-7.0

Legal limit (MCL): 10 · Health goal (PHG): 0.004 — not an enforceable limit

Violation per report: No

Typical source, per the report: Erosion of natural deposits

Table I · report p. 22 · official report

Barium

The utility reported: 130 µg/L

Reported range: <100-130

Legal limit (MCL): 1000 · Health goal (PHG): 2000 — not an enforceable limit

Violation per report: No

Typical source, per the report: Erosion of natural deposits

Table I · report p. 22 · official report

Bromate

The utility reported: 4.1 µg/L

Reported range: <1-12

Legal limit (MCL): 10 · Health goal (PHG): 0.1 — not an enforceable limit

Violation per report: No

Typical source, per the report: By-product of ozone disinfection; formed under sunlight for chlorinated water

Table I · report p. 22 · official report

Chromium (Hexavalent)

The utility reported: 0.1 µg/L

Reported range: <0.1-0.6

Legal limit (MCL): 10 · Health goal (PHG): 0.02 — not an enforceable limit

Violation per report: No

Typical source, per the report: Industrial discharge; erosion of natural deposits

Table I · report p. 22 · official report

Fluoride

The utility reported: 0.8 mg/L

Reported range: 0.2-0.8

Legal limit (MCL): 2 · Health goal (PHG): 1 — not an enforceable limit

Violation per report: No

Typical source, per the report: Erosion of natural deposits; water additive that promotes strong teeth

Table I · report p. 22 · official report

Gross Alpha Particle Activity

The utility reported: 5 pCi/L

Reported range: <3-5

Legal limit (MCL): 15 · Health goal (PHG): none — not an enforceable limit

Violation per report: No

Typical source, per the report: Naturally present in the environment

Table I · report p. 22 · official report

Gross Beta Particle Activity

The utility reported: 4.2 pCi/L

Reported range: <4-6

Legal limit (MCL): 50 · Health goal (PHG): none — not an enforceable limit

Violation per report: No

Typical source, per the report: Naturally present in the environment

Table I · report p. 22 · official report

Nitrate (as N)

The utility reported: <0.4 mg/L

Reported range: <0.4-1.4

Legal limit (MCL): 10 · Health goal (PHG): 10 — not an enforceable limit

Violation per report: No

Typical source, per the report: Erosion of natural deposits; runoff and leaching from fertilizer use

Table I · report p. 22 · official report

Turbidity

The utility reported: 0.1 NTU

TT: 1 · Health goal (PHG): none — not an enforceable limit

Violation per report: No

Typical source, per the report: Soil runoff

Table I · report p. 22 · official report

Uranium

The utility reported: 3.4 pCi/L

Reported range: <1-4.8

Legal limit (MCL): 20 · Health goal (PHG): 0.43 — not an enforceable limit

Violation per report: No

Typical source, per the report: Erosion of natural deposits

Table I · report p. 22 · official report

Bromate (uncovered reservoirs)

The utility reported: 1.3 µg/L

Reported range: <1-2.2

Legal limit (MCL): 10 · Health goal (PHG): 0.1 — not an enforceable limit

Violation per report: No

Typical source, per the report: By-product of ozone disinfection; formed under sunlight for chlorinated water

Table I (CONT'D) · report p. 23 · official report

Chlorine Residual, Total

The utility reported: 1.7 mg/L

Reported range: 1.4-2

MRDL: 4 · Health goal (MRDLG): 4 — not an enforceable limit

Violation per report: No

Typical source, per the report: Drinking water disinfectant added for treatment

Table I (CONT'D) · report p. 23 · official report

Copper (at-the-tap)

The utility reported: 529 µg/L

AL: 1300 · Health goal (PHG): 300 — not an enforceable limit

Violation per report: No

Typical source, per the report: Internal corrosion of household water plumbing systems

Table I (CONT'D) · report p. 23 · official report

Haloacetic Acids (Five) (HAA5)

The utility reported: 13.4 µg/L

Reported range: 4-14.7

Legal limit (MCL): 60 · Health goal (PHG): none — not an enforceable limit

Violation per report: No

Typical source, per the report: By-product of drinking water disinfection

Table I (CONT'D) · report p. 23 · official report

Lead (at-the-tap)

The utility reported: <5 µg/L

AL: 15 · Health goal (PHG): 0.2 — not an enforceable limit

Violation per report: No

Typical source, per the report: Internal corrosion of household water plumbing systems

Table I (CONT'D) · report p. 23 · official report

Total Coliform Bacteria

The utility reported: 3.4 % Positives

Reported range: 0% - 3.4%

Legal limit (MCL): ≤5% of monthly samples · Health goal (PHG): none — not an enforceable limit

Violation per report: No

Typical source, per the report: Naturally present in the environment

Table I (CONT'D) · report p. 23 · official report

Total Trihalomethanes (TTHM)

The utility reported: 33.8 µg/L

Reported range: 15.2 - 35.2

Legal limit (MCL): 80 · Health goal (PHG): none — not an enforceable limit

Violation per report: No

Typical source, per the report: By-product of drinking water chlorination

Table I (CONT'D) · report p. 23 · official report

Los Angeles Department of Water and Power (LADWP) — unregulated monitoring and secondary (aesthetic) records (29)

Unregulated means monitored without an applicable enforceable legal limit (MCL) — it does not mean unimportant or illegal. Secondary records address aesthetic, cosmetic, or technical effects such as taste, odor, staining, or scale, and are not automatically primary health standards.

Aluminum

The utility reported: 96 µg/L

Reported range: <50-100

Typical source, per the report: Erosion of natural deposits; residue from some surface water treatment processes

Table II · report p. 24 · official report

Chloride

The utility reported: 92 mg/L

Reported range: 24-99

Typical source, per the report: Runoff / leaching from natural deposits; seawater influence

Table II · report p. 24 · official report

Color, Apparent (unfiltered)

The utility reported: 3 ACU

Reported range: 1-3

Typical source, per the report: Naturally-occurring organic materials

Table II · report p. 24 · official report

Copper

The utility reported: <50 µg/L

Reported range: <50

Typical source, per the report: Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives

Table II · report p. 24 · official report

Foaming Agents

The utility reported: <50 µg/L

Reported range: <50-60

Typical source, per the report: Municipal and industrial waste discharges

Table II · report p. 24 · official report

Iron

The utility reported: <100 µg/L

Reported range: <20-20

Typical source, per the report: Leaching from natural deposits; industrial wastes

Table II · report p. 24 · official report

Manganese

The utility reported: <5 µg/L

Reported range: <2-3.5

Typical source, per the report: Leaching from natural deposits

Table II · report p. 24 · official report

Specific Conductance

The utility reported: 873 µS/cm at 25°C

Reported range: <15-987

Typical source, per the report: Substances that form ions when in water; seawater influence

Table II · report p. 24 · official report

Sulfate (as SO4)

The utility reported: 182 mg/L

Reported range: 24-218

Typical source, per the report: Runoff / leaching from natural deposits

Table II · report p. 24 · official report

Total Dissolved Solids (TDS)

The utility reported: 545 mg/L

Reported range: 187-625

Typical source, per the report: Runoff / leaching from natural deposits

Table II · report p. 24 · official report

Turbidity

The utility reported: 0.2 NTU

Reported range: <0.1-0.2

Typical source, per the report: Soil runoff

Table II · report p. 24 · official report

Zinc

The utility reported: <0.05 mg/L

Reported range: <0.01-0.01

Typical source, per the report: Runoff/leaching from natural deposits; industrial wastes

Table II · report p. 24 · official report

Alkalinity, Total (as CaCO3)

The utility reported: 110 mg/L

Reported range: 86-124

Typical source, per the report: Erosion of natural deposits

Table III · report p. 25 · official report

Ammonia + Chloramines (as N)

The utility reported: 0.5 mg/L

Reported range: 0.3-1

Typical source, per the report: Drinking water disinfectant added for treatment

Table III · report p. 25 · official report

Bicarbonate Alkalinity (as HCO3)

The utility reported: 128 mg/L

Reported range: 105-139

Typical source, per the report: Naturally-occurring dissolved gas; erosion of natural deposits

Table III · report p. 25 · official report

Boron

The utility reported: 360 µg/L

Reported range: 172-514

Typical source, per the report: Erosion of natural deposits

Table III · report p. 25 · official report

Bromide

The utility reported: 0.05 mg/L

Reported range: <0.02-0.08

Typical source, per the report: Runoff / leaching from natural deposits; seawater influence

Table III · report p. 25 · official report

Calcium

The utility reported: 56 mg/L

Reported range: 22-70

Typical source, per the report: Erosion of natural deposits; natural hot springs

Table III · report p. 25 · official report

Chlorate

The utility reported: 32 µg/L

Reported range: <20-32

Typical source, per the report: Byproduct of drinking water chloramination and industrial processes

Table III · report p. 25 · official report

Hardness, Total (as CaCO3)

The utility reported: 236 mg/L

Reported range: 78-280

Typical source, per the report: Erosion of natural deposits

Table III · report p. 25 · official report

Lithium

The utility reported: 88 µg/L

Reported range: <10-128

Typical source, per the report: Erosion of natural deposits

Table III · report p. 25 · official report

Magnesium

The utility reported: 22 mg/L

Reported range: 6-25

Typical source, per the report: Erosion of natural deposits

Table III · report p. 25 · official report

N-Nitrosodimethyhlamine (NDMA)

The utility reported: 2.1 ng/L

Reported range: <2-2.1

Typical source, per the report: Byproduct of drinking water chloramination and industrial processes

Table III · report p. 25 · official report

The utility reported: 8.3 Unit

Reported range: 7.0-8.7

Typical source, per the report: Naturally-occurring dissolved gas and minerals

Table III · report p. 25 · official report

Phosphate, Ortho (as PO4)

The utility reported: 0.03 mg/L

Reported range: <0.03-0.06

Typical source, per the report: Erosion of natural deposits

Table III · report p. 25 · official report

Potassium

The utility reported: 4.4 mg/L

Reported range: 2.8-5.0

Typical source, per the report: Erosion of natural deposits

Table III · report p. 25 · official report

Silica (as SiO2)

The utility reported: 15 mg/L

Reported range: 11-19

Typical source, per the report: Erosion of natural deposits

Table III · report p. 25 · official report

Sodium

The utility reported: 89 mg/L

Reported range: 32-100

Typical source, per the report: Erosion of natural deposits

Table III · report p. 25 · official report

Temperature

The utility reported: 18.0 ºC

Reported range: 8.1-28.6

Typical source, per the report: Natural seasonal fluctuation

Table III · report p. 25 · official report

Detection, enforceable limits, health goals, advisory levels, and violations are different concepts.

The Three C's — 3 of 3

Corrosion

What conditions could influence pipes, fixtures, and a water heater?

The utility reported: 7.7-8.3 Unit

Table III · report p. 25 · official report

Alkalinity, Total

The utility reported: 98-110 mg/L as CaCO3

Table III · report p. 25 · official report

Chloride

The utility reported: 36-92 mg/L

Table II · report p. 24 · official report

Sulfate

The utility reported: 41-182 mg/L

Table II · report p. 24 · official report

Lead (at-the-tap)

The utility reported: <5 µg/L

Table I (CONT'D) · report p. 23 · official report

Copper (at-the-tap)

The utility reported: 529 µg/L

Table I (CONT'D) · report p. 23 · official report

Gross Alpha Particle Activity

The utility reported: 5 pCi/L

Reported range: <3-5

Typical source, per the report: Naturally present in the environment

Table I · report p. 22 · official report

Chloride

The utility reported: 92 mg/L

Reported range: 24-99

Typical source, per the report: Runoff / leaching from natural deposits; seawater influence

Table II · report p. 24 · official report

Copper

The utility reported: <50 µg/L

Reported range: <50

Typical source, per the report: Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives

Table II · report p. 24 · official report

Sulfate (as SO4)

The utility reported: 182 mg/L

Reported range: 24-218

Typical source, per the report: Runoff / leaching from natural deposits

Table II · report p. 24 · official report

Alkalinity, Total (as CaCO3)

The utility reported: 110 mg/L

Reported range: 86-124

Typical source, per the report: Erosion of natural deposits

Table III · report p. 25 · official report

Bicarbonate Alkalinity (as HCO3)

The utility reported: 128 mg/L

Reported range: 105-139

Typical source, per the report: Naturally-occurring dissolved gas; erosion of natural deposits

Table III · report p. 25 · official report

The utility reported: 8.3 Unit

Reported range: 7.0-8.7

Typical source, per the report: Naturally-occurring dissolved gas and minerals

Table III · report p. 25 · official report

Phosphate, Ortho (as PO4)

The utility reported: 0.03 mg/L

Reported range: <0.03-0.06

Typical source, per the report: Erosion of natural deposits

Table III · report p. 25 · official report

This is system-level water-quality context, not a diagnosis of your home. Plumbing materials, water age, temperature, maintenance, and equipment design can materially change what happens at a specific property.

Whole-Home Relevance

What this may mean throughout your home

Local conditions can be relevant to equipment and fixtures — actual effects depend on your property.

Water heater (tank and tankless)

What the local report can tell us: The report's hardness and mineral values above are the system-level inputs most relevant to scale and sediment where water is heated.
What a homeowner may notice: Hardness minerals can contribute to scale on heating surfaces, sediment in tanks, and more frequent flushing or descaling needs.
What the report cannot tell us: Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
Responsible next step: Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.

Dishwasher and washing machine

What the local report can tell us: Reported hardness and secondary (aesthetic) records are the relevant system-level context for spotting and residue.
What a homeowner may notice: Hard water can change soap behavior and may contribute to spotting on dishes and residue in laundry.
What the report cannot tell us: Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
Responsible next step: Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.

Pipes, fixtures, faucets, and supply lines

What the local report can tell us: The corrosion-related inputs above (such as pH) describe the water entering the property — not the condition of any specific plumbing.
What a homeowner may notice: Mineral deposits can appear on aerators and fixtures; corrosion outcomes depend on materials, age, and water conditions together.
What the report cannot tell us: Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
Responsible next step: Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.

Drinking and cooking water

What the local report can tell us: The contaminant records above show what the utility reported for the system and period, with each benchmark type labeled.
What a homeowner may notice: Taste, odor, or aesthetic preferences can be noticeable even when health-based standards are met.
What the report cannot tell us: Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
Responsible next step: Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.

Decision Pathways

Treatment pathways to evaluate

Treatment is a decision pathway, not a product conclusion — no equipment can be responsibly chosen from city-level data alone.

The evaluation sequence we follow, in order:

1Define the concern
2Verify utility-level and home-specific evidence
3Choose point of treatment
4Verify the exact certified reduction claim for the exact model
5Review tradeoffs and maintenance

Water filtration

Objective it can address: Specific substances or aesthetic conditions (taste, odor, chlorine character).
Point of treatment: Point of entry or point of use, depending on the objective.
Limitations to verify: A filter works only for the conditions and reduction claims its exact design and certification support — filtration does not soften water.

Certification note: a standard number alone doesn't prove a product reduces every contaminant — the exact model's certified claim must match your objective.

Water softening

Objective it can address: Hardness minerals (calcium and magnesium) and the scale they can contribute to.
Point of treatment: Typically point of entry, confirmed by evaluation.
Limitations to verify: Softening primarily exchanges hardness minerals — it is not a universal contaminant-removal device.

Certification note: a standard number alone doesn't prove a product reduces every contaminant — the exact model's certified claim must match your objective.

Reverse osmosis

Objective it can address: Specified dissolved substances at a dedicated outlet, commonly drinking and cooking water.
Point of treatment: Typically point of use.
Limitations to verify: Produces a reject-water stream and needs pressure and maintenance; verify the exact NSF/ANSI 58 reduction claims for the exact model. It is not automatically the best system for every home.

Certification note: a standard number alone doesn't prove a product reduces every contaminant — the exact model's certified claim must match your objective.

When testing is the right next step

Use a certified laboratory when the concern is tap-specific, property-specific, or not resolved by the utility report.

When inspection is the right next step

Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.

Evidence You Can Check

Official reports, sources, and methodology

Official report — Los Angeles Department of Water and Power (LADWP)

2025 Drinking Water Quality Report · data year 2024 · 2024 data retained; monitor for the next official update

View the 2024 Los Angeles Department of Water and Power (LADWP) Consumer Confidence Report

Source water, per the report: Los Angeles Aqueduct (44%), Purchased imported water from the Metropolitan Water District of Southern California (MWD) (52%), Local groundwater (1%), Recycled water (3%).

The official utility report and controlling regulator determine compliance status. This page does not replace utility notices or regulator guidance.

Profile verified as of 2026-07-12 (framework v1.0). Values, units, ranges, periods, and compliance wording are preserved from each official report. Spot an error? Call (877) 798-7487 or use the contact form and we'll review it against the source report and correct it.

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Property-Specific Next Step

Request a Water Quality Evaluation

Request a water-heater and water-quality evaluation tailored to the property, equipment, and homeowner objective.

A property-specific evaluation confirms your goals, provider, tap conditions, plumbing, equipment, installation, and maintenance before any treatment recommendation — this profile alone is never used to prescribe equipment.

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